ASP.Net Examples

Different types of Action Results in MVC

2017-02-16T11:59:00.000+05:30

In MVC controller may have one or more actions and can return different type of result like if you want to return Json, JavaScript, empty result, return view etc. ActionResults is the base class of all result type. ActionResults is abstract class. As ActionResults is the base class for all type of action results this means return type of ActionResults can be any of the below listed result types. In this topic we will learn how to use ViewResult, PartialViewResult, RedirectResult and JsonResult.

1.ViewResult (View): This return type is used to return a webpage from an action method.

2. PartialviewResult (Partialview): This return type is used to send a part of a

view which will be rendered in another view.

3. RedirectResult (Redirect): This return type is used to redirect to any other

controller and action method depending on the URL.

4. RedirectToRouteResult (RedirectToAction, RedirectToRoute): This return

type is used when we want to redirect to any other action method.

5. ContentResult (Content): This return type is used to return HTTP content

type like text/plain as the result of the action.

6. jsonResult (json): This return type is used when we want to return a JSON message.

7. javascriptResult (javascript): This return type is used to return JavaScript

code that will run in browser.

8. FileResult (File): This return type is used to send binary output in response.

9. EmptyResult: This return type is used to return nothing (void) in the result.

Advantages of MVC

2017-02-16T11:46:00.004+05:30

1. One of the main advantage is that it will be easier to manage the complexity as the application is divided into model,view and controller.

2. It gives us the full control over the behavior of an application as it does not use view state or server-based forms.

3. It provides better support for test-driven development (TDD).

4. You can design the application with a rich routing infrastructure as it uses a Front Controller pattern that processes Web application requests through a single controller.

google-site-verification: google60f25276d1e291a2.html

2017-02-13T16:58:00.001+05:30

google-site-verification: google60f25276d1e291a2.html

Create and Schedule a Job in SQL Server 2008

2016-12-16T11:53:00.001+05:30

SQL Server agent can be used to create JOBS which can be scheduled to execute automatically. SQL Server Agent uses SQL Server to store job information. Jobs can have one or more job steps. Each step contains its own task.Each action in a job is a job step.We can schedule the job based on need as daily, weekly, monthly, hourly etc

For example, Let us create a job to back up a database automatically.

Steps to create Job in SQL Server Agent

1. Expand SQL Server Agent in Object Explorer.(If SQL Server Agent is stopped ,right click and start it)

2.Right click Job->New job.

3.Fill the Name field with a name for your job,Give description.

4. On the left side of the New Job window, you’ll see a Steps icon under the Select a page.Next add the individual steps for your job. Click the New button to create a new job step and you will see the New Job Step window.

Use the Step Name textbox to provide a name for the Step. select the database where the job has to be applied.
Use the Command textbox to give the Transact-SQL syntax corresponding to the desired action for this job step. Once you have completed entering the command, click the Parse button to verify the syntax.
Validate the syntax, click OK to create the step.

5.Schedule the job by clicking the Schedule icon in the Select a Page.Then schedule new job.

6.Create alerts for your job by Giving alert name and also select the database.Also select the type of alert and severity of your alert

7.Specify the actions to be performed when the job completes or when job fails.

How to setup your Blog with GoDaddy

2016-12-08T17:48:00.002+05:30

GoDaddy DNS service supports this feature so Let's show you how it's done:
For this demo, I assume you have an existing blog and you have already purchased a domain on GoDaddy.

Step 1: Go to the Settings Tab of your blog in the Blogger UI and click on the "Add a custom domain" link.

Step 2: Enter the URL you would like to use for your blog and press Save. I'm using "www.thisdemoblog.com" but the URL doesn't need to start with www such as "blog.mridey.com" where I published this article.

Step 3: You will get an error. It's expected as you have not configured GoDaddy with the DNS settings required. Now click on the "DNS settings file" link and save the file. Keep this window open, you'll need it later.

Step 4: In a new window, go to GoDaddy, login, go to the Domain Control Panel and click on your domain name.

Step 5: Click on the "DNS Zone File" tab.

Step 6: Click on the Edit button.

Step 7: We need to delete some of the existing records that GoDaddy adds by default. Select all the "A" records with "@" as host as well as the CNAME record "www" (if the URL you want to use starts with www) and press the Delete button.

Step 8: Press the "Save Zone File" button.

Step 9: Press Ok to confirm.

Step 10: Press Ok to confirm again. :)

Step 11: Now let's load the new records. Click the Import/Export button and select "Import".

Step 12: Click "Select File" and find the file you have saved in step 3, then click the "I understand ..." checkbox and press the Ok button.

Step 13: Press Ok to confirm.

Step 14: You should be able to see your new records loaded in GoDaddy. Four "A" records as well as two CNAME records. All good.

Step 15: Go back to the Blogger settings window we kept open in Step 3 and click "Save" again.

Step 16: If like me the GoDaddy DNS server processed the changes really quickly, it should all work fine and the settings should be accepted. You should be back to the main settings with your new custom domain accepted as the blog Address. So click on "Edit".

If Step 16 fails, be patient and retry later. It can take up to 48h for DNS settings to propagate.

Step 17: Enable the "Redirect ..." checkbox and press Save. This is to allow "naked domain" redirect i.e. when users type your domain name without the www at the beginning.

Step 18: Finally click the "View blog" button at the top of Blogger UI, it should all work fine and your blog should now be enabled with a custom domain.

How to Remove Blank Lines in Visual Studio

2016-12-01T14:24:00.000+05:30

We can use regular expressions to find blank lines and replace them with white spaces.

Following steps are to find blank lines and replace:

In visual studio 2012.

1. Press “ Ctrl+ Shift + H “.

And window shown like:

2. Write regular expression For (vs2012) "^(?([^\r\n])\s)*\r?$\r?\n" or for vs 2010 (^$\n or ^&\n)in find what box.

3. Leave Replace with box as empty.

4. In find check Use Regular Expressions.

Then Replace or Replace all as you want.

These steps will remove all blank spaces from current document or whole project as you choose Look in box.

Other regular expressions are predefined by visual studio as in below image.(or can see by (a)+ button on find what box).

What is IIS - Internet Information Server

2016-11-30T16:55:00.001+05:30

Internet Information Server (IIS) is one of the most popular web servers from Microsoft that is used to host and provide Internet-based services to ASP.NET and ASP Web applications. A web server is responsible for providing a response to requests that come from users. When a request comes from client to server IIS takes that request from users and process it and send response back to users.

Internet Information Server (IIS) has it's own ASP.NET Process Engine to handle the ASP.NET request. The way you configure an ASP.NET application depends on what version of IIS the application is running on.

Internet Information Server (IIS) includes a set of programs for building and administering Web applications, search engines, and support for writing Web-based applications that access databases such as SQL Server. With IIS, you can make your computer to work as a Web server and provides the functionality to develop and deploy ASP.NET Web applications on the server. You can also set security for a particular Website for specific Users and Computer in order to protect it from unauthorized access.

IIS helps organizations to increase Web sites and application availability while lowering system administration and cost of deployment. IIS 7.5 supports HTTP, HTTPS, FTP, FTPS, SMTP and NNTP.

Slow Visual Studio Performance ... Solved

2016-11-30T16:36:00.000+05:30

I had an odd performance-related issue today. My Microsoft Visual Studio seemed to be taking far too long to perform even the simplest of operations. I Googled around and tried a few ideas that people had such as disabling add-ins or clearing Visual Studio's recent projects list but those suggestions didn't seem to solve the problem. I remembered that the Windows Sys Internals website had a tool called Process Monitor that would sniff registry and file accesses by any running program. It seemed to me that Visual Studio was up to something and Process Monitor should help me figure out what it was. I downloaded the most recent version, and after fiddling around a bit with its display filters, ran it and to my horror, I saw that Visual Studio was so slow because it was accessing the more than 10,000 folders in
C:\Users\krintoul\AppData\Local\Microsoft\WebSiteCache
on most IDE operations. I'm not sure why there were that many folders and moreover, wasn't sure what Visual Studio was doing with them, but after I zipped those folders up and moved them somewhere else, Visual Studio's performance improved tremendously.

TFS Installation Steps

2016-11-30T16:32:00.001+05:30

How to: Install Team Foundation Server Using the Advanced Configuration

If you want to change the default installation options for Team Foundation Server, use the advanced configuration, which lets you configure Team Foundation Server on multiple servers and change many other options.

Why use advanced? The standard installation might not fit your needs. You might want to customize a single server installation or install Team Foundation Server and its configuration database on different servers. Perhaps you already have SQL Server or SharePoint Products running in your organization and you'd like to use one of these installations to host team projects or the data for Team Foundation Server. If you use the optional features that require prerequisite server software, these installations can also be hosted on different servers. If you use multiple servers, you can distribute the load between Team Foundation Server and the configuration database, or you can ensure that prerequisite server software for features such as reporting or the portal site is running on capable hardware.

System Requirement

You can install Team Foundation Server on a server that is running one of the following operating systems:

Server operating systems:

64-bit version of Windows Server 2008 with SP2
64-bit versions of Windows Server 2008 R2 ¹ with SP1
64-bit versions of Windows Server 2012

IIS Requirement
IIS should be configured on Windows Server machine

SQL Server Requirements for Team Foundation Server

Supported editions	SQL Server 2008, R2 Express¹ SQL Server 2008, R2 Standard Edition¹ SQL Server 2008, R2 Enterprise Edition with SP 1 CU1 (Aug 25, 2011)² SQL Server 2012, Express¹ SQL Server 2012, Standard Edition¹ SQL Server 2012, Enterprise Edition
Required for Team Foundation Server	Database Engine Services Full-Text Search (or Full-Text and Semantic Extractions for Search in SQL Server 2012)

Accounts Required for Installation of Team Foundation Server

Component	Sample user logon name	Requirements
Team Foundation Server	TFSSERVICE	You can specify a built-in account or a user account. If you specify a user account, it must have the Log on as service permission. You must not use the account that you use to install Team Foundation Server as the account for TFSSERVICE.
Team Foundation Build	TFSBUILD	You can specify a built-in account or a user account. If you use a user account, it must have the Log on as a service permission.
Team Foundation Server Proxy	TFSPROXY	You can specify a built-in account or a user account. If you use a user account, it must have the Log on as a service permission.
Reporting	TFSREPORTS	You must specify a user account that has the Allow log on locally permission. Default: You are prompted for this account. You cannot use a built-in account for the report reader account.
SharePoint Products	WSSSERVICE	You must specify a user account. Default: If you install Team Foundation Server with the default options, the account that you specified as the report reader account is also used for this account.

The Steps for IIS are for understanding. In Reality starting with TFS 2012 you dont need to configure IIS manually. TFS installation takes care of this step

Configure IIS 7.0 on Windows Server 2008 R2
Select Server manager and Web Server Role to Configure IIS

Select asp.net and IIS 6 Management compatibility from the Role services Option

SQL Server 2008 R2 Installation with SP2

We need Database Engine Services and Full Text Search Feature for TFS installation

For Reporting Services We could select Report service and Analysis Service. Client Connecting tools Connectivity with SQL Management tools are important for tool like SQL Management Studio.

Important: If SQL administrator is not specified below than SQL will get looked and had to be used with SA login to update information.

For TFS 2012 with SQL Server 2008 R2 SP1 with Cumulative update 1 is mandatory, I have installed SQL SP2 to meet TFS requirement

Follow the wizard and complete the SQL server 2008 R2 SP1 Installation.

TFS 2012 Installation and Configuration

In the Team Foundation Server Configuration tool, choose Advanced, and then choose Start Wizard.

The Advanced Configuration wizard appears.

2. Read the Welcome screen, and then choose Next.

In SQL Server Instance, type the name of the server that is running SQL Server or the named instance that will host the configuration databases, and choose Next.

4. Under Service Account, choose Use a system account to use a built-in account or Use a user account to use a domain or local account. If you are using a user account, you must type the password. To test the user account and password combination, you can optionally choose Test.

Under Authentication Method, choose NTLM or Negotiate (Kerberos), and then choose Next.
- If you choose NTLM, NTLM authentication is used. This option is the default setting.
- If you choose Negotiate (Kerberos), Kerberos authentication is attempted first. If that attempt fails, NTLM authentication is used.

Under Web Site, type a name in Web Site Name and a port number in Port. This is the name that appears in Internet Information Services (IIS) and the port number used to connect to Team Foundation Server.

The default values for Web Site are Team Foundation Server and 8080.

Under IIS Virtual Directory, you can use the default value of tfs or optionally type a virtual directory name.

Under Web Site, note the Team Foundation Server site URL, which is dynamically assembled based on your input in Web Site and IIS Virtual Directory. Clients use this URL to connect to Team Foundation Server. Choose Next

Use the Configure Reporting for Team Foundation Server page to opt in or out of using reporting. Select the Configure Reporting for use with Team Foundation Server check box to use reporting, or clear the check box to skip reporting, and then choose Next.

If you specified a user account for the service account of Team Foundation Server in step 4, you must select the Use a different account than the Team Foundation Server service account for the report reader account check box to use a different account

Use the Configure SharePoint for Team Foundation Server page to opt in or out of using SharePoint Products. Clear the check box to skip SharePoint Products. Choose Next.

If you selected the check box to configure SharePoint Products, perform one of the following procedures:

Install and configure SharePoint on this machine.
1. Choose Install and configure SharePoint on this machine and choose Next.
2. Choose the big Install SharePoint Foundation 2010 button. Once the install completes, choose Next.
3. Type a user account and password for the service account forSharePoint Foundation 2010 (WSSSERVICE). If you specified a user account for the service account of Team Foundation Server in step 4, you must select the Use a different account than the Team Foundation Server service account for the SharePoint farm check box to use a different account.
4. Choose Next.

Select the Create a new team project collection check box to create a collection, or clear that check box to skip that step.

On the Review page, review the settings, and choose Next.

The wizard validates your configuration.

13. Choose Configure.

The wizard applies configuration settings. This process might take several minutes

For Configuring Build Service with TFS

Contact me

2016-11-30T16:24:00.000+05:30

SQL SERVER – Find Currently Running Query – T-SQL

2015-11-03T13:29:00.004+05:30

This is the script which I always had in my archive. Following script find out
which are the queries running currently on your server.

SELECT
sqltext.TEXT,
req.session_id,
req.status,
req.command,
req.cpu_time,req.total_elapsed_time
FROM sys.dm_exec_requests req CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS sqltext

While running above query if you find any query which is running for long time
it can be killed using following command.

KILL [session_id]

Determining database size using T-SQL scripting

2015-06-03T12:48:00.001+05:30

SELECT DB_NAME(database_id) AS DatabaseName,

Name AS Logical_Name,

Physical_Name, (size*8)/1024 SizeMB

FROM sys.master_files

Find Column Names From Table in SQL Server

2015-03-06T10:57:00.000+05:30

Select Column_Name
From INFORMATION_SCHEMA.COLUMNS
Where TABLE_NAME='CustomerOrderDetails'

ExportLicenseNumber

CustomerOrderId

RepairSerialNumber

IsInitialQuote

Revision

CODate

COReceiptDate

PriorityCodeOfCustomer

CustomerRefNumber

CustomerRefDefinition

OrderFromCustomerId

DeliverToCustomerId

ResponsibleLocationId

DeliveryPoint

DeliveryTerms

PaymentTerms

ShipmentViaSupplierId

OtherCommentsAndSpecialInstructions

CurrencyId

LeadTime

LeadTimeUOM

QuoteTypeId

QuotePriceType

ExpectedDeliveryDate

EstimatedDeliveryDate

PartialShipmentAllowed

ShippingAndHandlingPrice

ShippingAndHandlingPriceUSD

OtherChargesType

OtherCharges

OtherChargesUSD

OtherCharges1

OtherCharges1USD

OtherCharges1Type

IncountryTransportation

IncountryTransportationUSD

Insurance

TaxPercentage

DiscountUSD

Discount

ItemReferenceNumber

ReferenceNumber

PartId

PartConditionId

SupplierPartNumber

Quantity

Price

PriceUSD

IsItemClosed

CustomerOrderNotes

OrderFromCustomerAddressId

OrderFromcustomerPOCId

CustomerAddressId

CustomerPOCId

DeliverToAddressId

DeliverToPOCId

SalesExportLicenceRequired

RepairExportLicenceRequired

ExportLicenseTypeId

ItemDecremented

DSP

ExportLicenseCategoriesId

ExportToCountryId

EndUserCountryId

EndUserCustomerId

CFR1234a

CFR1234b

DSP61

WarrantyRequirement

CustomerRefOrderNumber

IsArchived

COCreationDate

CustomerOrderItemNote

DeclaredCustomsValueoftheGoodbyCustomer

Remove blank lines from code in Visual Studio 2010

2015-03-05T11:54:00.001+05:30

1. Click Ctrl+H (quick replace)
2. Tick "Use Regular Expressions"
3. In Find specify "^$\n"
4. In Replace box delete everything.
5. Click "Replace All"
All Blank lines will be deleted.

5 Ways to send data between ASP.NET Pages

2014-12-12T18:12:00.003+05:30

How many ways do you know to send the data between ASP.NET Pages? In this post I’m going to list 5 different ways. First 2-3 ways are very well-known and last 2-3 ways are not much popular. You will find here mostly inline methods to receive the data on different pages. You can download the complete code.

So, let’s start with the very well-known one.

1. Using Session State or Application Variable

Using this technique I will store the data in session variable on the client machine and on the next page will grab it. Using Application Variable instead of Session Variable is recommend by experts.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<asp:Button ID="btnSessionState" runat="server" Text="Session State" OnClick="btnSessionState_Click"/>

Code-Behind:

protected void btnSessionState_Click(object sender, EventArgs e)

{

Session["Data"] = txtData.Text;

Response.Redirect("SessionState.aspx");

}

Receiver ASPX Page:

<div>

<h1>Session State</h1>

Data is: <%=Session["Data"] %>

And you all set, run it test it.

2. Using Query String

Using this technique I will add my data with URL and on the next page will grab it.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<asp:Button ID="btnQueryString" runat="server" Text="Query String" OnClick="btnQueryString_Click" />

Code-Behind:

protected void btnQueryString_Click(object sender, EventArgs e)

{

Response.Redirect("QueryString.aspx?Data=" + Server.UrlEncode(txtData.Text));

}

Receiver ASPX Page:

<h1>Query String</h1>

Data is: <%=Server.UrlDecode(Request.QueryString["Data"]) %>

And you all set, run it test it.

3. Using HttpPost

Using this technique I will call a post back url and the on next page using Request.From I will grab it.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<asp:Button ID="btnHttpPost" runat="server" Text="HTTPPost" PostBackUrl="~/HttpPost.aspx" />

Note: There is no any code-behind method call instead of a postbackurl in button attribute.

Receiver ASPX Page:

<h1>HttpPost</h1>

Data is: <%=Request.Form["txtData"] %>

And you all set, run it test it.

4. Using Public Properties

Using this technique I will send the using a public method and on the next page will grab it using PreviousPage.MethodName.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<asp:Button ID="btnPublicProperties" runat="server" Text="Public Properties"OnClick="btnPublicProperties_Click" />

Code-Behind:

protected void btnPublicProperties_Click(object sender, EventArgs e)

{

Server.Transfer("PublicProperties.aspx");

}

public string PublicData

{

get

{

return txtData.Text;

}

Receiver ASPX Page:

<h1>Public Properties</h1>

Data is: <%=PreviousPage.PublicData %>

And you all set, run it test it.

5. Using Controls

Using this technique I will just redirect the user on next page and on the next page will use PreviousPage.FindControl to grab the data.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<asp:Button ID="btnControl" runat="server" Text="Control" OnClick="btnControl_Click" />

Code-Behind:

protected void btnControl_Click(object sender, EventArgs e)

{

Server.Transfer("Control.aspx");

}

Receiver ASPX Page:

<h1>Control</h1>

Data is: <asp:Label ID="Label1" runat="server" Text="Label" />

Receiver Code-Behind Page:

protected void Page_Load(object sender, EventArgs e)

{

var textbox = PreviousPage.FindControl("txtData") as TextBox;

if (textbox != null)

{

Label1.Text = textbox.Text;

}

And you all set, run it test it.

You can use any technique given above depending upon your business requirement.

SQL Server - Cursor

2014-09-25T15:37:00.002+05:30

Cursor is a variable in SQL Server Database which is used for row-by row operations. The cursor is so named because it indicates the current position in the resultset.

Let us look this example.

Here I am just taking 2 columns from a table and passing through the cursor and printing them.

CREATE PROCEDURE Usp_cursor_test
AS
  BEGIN
      –Declaring the  variables needed for cursor to store data
      DECLARE @Name VARCHAR(50)
      DECLARE @EmptypeID INT
      –Declaring the Cursor cur_print For name and Emptypeid in the Employeedetails table
      DECLARE cur_print CURSOR FOR
        SELECT name,
               emptypeid
        FROM   employee.employeedetails
      –After declaring we have to open the cursor
      OPEN cur_print
      –retreives the First row from cursor and storing it into the variables.
      FETCH NEXT FROM cur_print INTO @Name, @EmptypeID
      – @@FETCH_STATUS returns the status of the last cursor FETCH statement issued against
      – any cursor currently opened by the connection.
      – @@FETCH_STATUS = 0 means The FETCH statement was successful.
      – @FETCH_STATUS = -1 The FETCH statement failed or the row was beyond the result set.
      – @@FETCH_STATUS = -2 The row fetched is missing.
      WHILE @@FETCH_STATUS = 0
        BEGIN
            –Operations need to be done,Here just printing the variables
            PRINT @Name
            PRINT @EmptypeID
            –retreives the NExt row from cursor and storing it into the variables.
            FETCH NEXT FROM cur_print INTO @Name, @EmptypeID
        END
      –Closing the cursor
      CLOSE cur_print
      – removes the cursor reference and relase cursor from memory
      – very Important
      DEALLOCATE cur_print
  END

Note:
Once cursor is opened we have to close the cursor
After the usage cursor should be deallocated from the memory.
As a DBA , I will not recommend the usage of cursors in all scenarios because it affects performance, since for each result it will have a network round trip which will cause a major performance issue in large data sets. You can make use of case statement instead of cursors for some scenarios.

Difference betweeb SQL Server 2005 and 2008

2014-09-25T15:32:00.001+05:30

S. No	SQL Server 2005	SQL Server 2008
1	XML datatype is introduced.	XML datatype is used.
2	Can not encrypt the entire database.	Can encrypt the entire database introduced in 2008.
3	Datetime is used for both date and time.	Date and time are seperately used for date and time
4	No table datatype is included.	Table datatype introduced.
5	SSIS is started using.	SSIS avails in this version.
6	CMS is not available.	Central Management Server(CMS) is Introduced.
7	PBM is not available	Policy based management(PBM) server is Introduced.

How to improve Visual Studio .NET Build Performance

2014-07-11T18:21:00.002+05:30

Here are some of the good ones I found that worked. Use at your own risk of course!

Clear Visual Studio temp files

Deleting the contents of the following temp directories can fix a lot of performance issues with Visual Studio and web projects:

C:\Users\richardd\AppData\Local\Microsoft\WebsiteCache

C:\Users\richardd\AppData\Local\Temp\Temporary ASP.NET Files\siteName

Clear out the project MRU list

Apparently Visual Studio sometimes accesses the files in your your recent projects list at random times, e.g. when saving a file. I have no idea why it does this, but it can have a big performance hit, especially if some are on a network share that is no longer available.

To clear your recent project list out, delete any entries from the following path in the registry:

HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\ProjectMRUList

Disable AutoRecover

In nearly four years, I have never used Visual Studio’s AutoRecover feature to recover work. These days, source control and saving regularly almost entirely eliminates the need for it.

To disable it and gain some performance (particularly with large solutions), go to Tools >Options > Environment > AutoRecover and uncheck Save AutoRecovery information.

Tracing in Asp.Net

2013-08-27T15:55:00.001+05:30

Tracing displays the details about how the code was executed. It refers to collecting information about the application while it is running. Tracing information can help you to troubleshoot an application.
It enables you to record information in various log files about the errors that might occur at run time.
You can analyze these log files to find the cause of the errors.

In .NET, we have objects called Trace Listeners. A listener is an object that gets the trace output and stores it to different places,
such as a window, a file on your locale drive, or a SQL Server.

The System.Diagnostics namespace contains the predefined interfaces, classes, and structures that are used for tracing. It supplies two classes, Trace and Debug, which allow you to write errors and logs related to the application execution. Trace listeners are objects that collect the output of tracing processes.
Page level Tracing

ASP.NET tracing can be enabled on a page-by-page basis by adding "Trace=true" to the Page directive in any ASP.NET page:

<%@ Page Language="C#" Trace="true" TraceMode = "SortByCategory"
Inherits ="System.Web.UI.Page" CodeFile="Default.aspx.cs" %>

Additionally, you can add the TraceMode attribute that sets SortByCategory or the default, SortByTime. You can use SortByTime to see the methods that take up the most CPU time for your application. You can enable tracing programmatically using the Trace.IsEnabled property.
Application Tracing

You can enable tracing for the entire application by adding tracing settings in web.config. In below example, pageOutput="false" and requestLimit="20" are used,
so trace information is stored for 20 requests, but not displayed on the page because pageOutput attribute is set to false.

The page-level settings take precedence over settings in Web.config,
so if enabled="false" is set in Web.config but trace="true" is set on the page, tracing occurs.

Web.Config Vs Machine.Config

2013-08-27T11:56:00.002+05:30

Machine.Config:-

1) This is automatically installed when you install .Net Framework.
2)Only one machine.config file can exist on a server.
3) This file is at the highest level in the configuration hierarchy.
4)Its like a common repository for standard items and its over ridden by web.config file.

5)With out the Machine.Config file Application can not be executed.

Web.Config:-

1) This is automatically created when you create an ASP.Net web application project.
2)This file inherits the settings from the machine.config
3)With out the Web.Config file Application can still be executed.

1. web.config and machine.config both are the configuration files
2. web.config files contains settings specific to a web application,
machine.config file contains settings to computer.

2013-08-27T10:54:00.003+05:30

Response.Write Vs Response.output.write()
Simply Response.write() is used to display the normal text and Response.output.write() is used to display the formated text.
Example:
Response.Output.Write(".Net{0},"ASP"); // Its write
Response.Write(".Net{0},"ASP"); // Its Wrong
Response.Redirect Vs Server.Transefer
1.Response.redirect sends message to the browser saying it to move to some different page while Server.transfer does not send any message to the browser but rather redirects the user directly from the server itself.So in Server.transfer their is no round trip while Response.redirect has a round trip hence puts a load on the server.
2.Using Sever.transfer you cannot redirect to a different server itself while using Response.redirect you can redirect to a different server also.
3.With Server.transfer you can preserve your information.It has a parameter called as "preserve form",so the existing query string etc will be avilable in the calling page.This is not possible in Response.redirect
Response.Redirect() Vs Response.RedirectParmanent()
Response.Redirect() :
Search Engine will take this redirection as Temporary(Status 301) and always keep first page in its cache.
Response.RedirectParmanent() :
Search Engine will take this a permanent redirection(Status 302) and will remove first page from its database and include second page for better performance on search.
Useage:
Response.Redirect used when your page is temporarily changed and will again be reverted to original within a short time.
Response.RedirectParmanent() when you are thinking of deleting the original page totally after the search engines changes its database.

Delegate

2013-08-27T10:24:00.000+05:30

A delegate is simply a variable pointing to a method (or a list of methods)

Delegate type in .Net is type safe object that points to a method(or list of methods) that can be invoked whenever you want.

Basically delegate has to contain three elements

The name (or Address) of method which it is calling
Arguments, if method contains any
Return value, if method returns any

You can invoke method synchronously or asynchronously by using delegate. Delegate uses three methods to invoke any method. Those are Invoke(), BeginInvoke() and EndInvoke(). Invoke() is used to invoke the method synchronously. BeginInvoke() and EndInvoke() methods are used to invoke the method asynchronously.

Creating Simple Delegate:

If you want to create a delegate in C#, you have to use “delegate” keyword. You can give any name to your delegate, but signature (parameters, return type) has to match with the method.

For example if you want to create simple delegate that match to Add() method which takes two integer parameters and return type is string.

public delegate string SimpleDelMath(int i, int j);

As shown above we are creating the simple delegate in C# which has same signature as compared with Add() method.

namespace DelegatesinCSharp

{

class SimpleDelegate

{

public static string Add(int x, int y)

{

return "Sum of " + x + " and " + y + " is : " + (x + y);

}

Invoke the Add() method by using SimpleDelMath delegate as shown below.

namespace DelegatesinCSharp

{

class Program

{

public delegate string SimpleDelMath(int i, int j);

static void Main(string[] args)

{

SimpleDelMath objDel = new SimpleDelMath(SimpleDelegate.Add);

Console.WriteLine(objDel(1, 2));

Console.ReadLine();

}

First we created the object for delegate SimpleDelMath, then we are invoking the method by passing the required parameters to delegate object as shown below.

objDel(1, 2);

Multicast Delegate in C#:

Multicast Delegate in C# means ability to invoke multiple methods by using delegate. To invoke multiple methods by using delegate, methods have to follow some rules.

For Multicast Delegate in C#, methods does not have return type and all methods need to have same signature.

namespace DelegatesinCSharp

{

class MulticastDelegate

{

public static void Add(int x, int y)

{

Console.WriteLine("Sum of " + x + " and " + y + " is : " + (x + y));

}

public static void sub(int x, int y)

{

Console.WriteLine( "Sub of " + x + " and " + y + " is : " + (x - y));

}

namespace DelegatesinCSharp

{

class Program

{

public delegate void MultiDelMath(int i, int j);

static void Main(string[] args)

{

MultiDelMath objMultiDel = new MultiDelMath(MulticastDelegate.Add);

//Adding another method to the delegate object

objMultiDel += new MultiDelMath(MulticastDelegate.sub);

objMultiDel(1, 2);

Console.ReadLine();

}

As shown above, created the delegate object MultiDelMath. At first added the Add() method to MultiDelMath delegate and next added the Sub() method to MultiDelMath delegate b y using += operator as shown below.

MultiDelMath objMultiDel = new MultiDelMath(MulticastDelegate.Add);

//Adding another method to the delegate object

objMultiDel += new MultiDelMath(MulticastDelegate.sub);

And we are invoking these two methods at a time by passing parameters as shown below.

objMultiDel(1, 2);

The output of multicast delegate is as shown below.

If you want, even you can delete method from delegate at any time as shown below.

namespace DelegatesinCSharp

{

class Program

{

public delegate void MultiDelMath(int i, int j);

static void Main(string[] args)

{

MultiDelMath objMultiDel = new MultiDelMath(MulticastDelegate.Add);

//Adding another method to the delegate object

objMultiDel += new MultiDelMath(MulticastDelegate.sub);

objMultiDel(1, 2);

//removing sub method from delegate object

objMultiDel -= new MultiDelMath(MulticastDelegate.sub);

objMultiDel(1, 2);

Console.ReadLine();

}

As shown above, you are deleteing method sub by using below code.

objMultiDel -= new MultiDelMath(MulticastDelegate.sub);

The output after deleting the second method is as shown below, only invoke first method Add().

Javascript Calling from Code behind in ASP.NET

2013-08-26T20:13:00.002+05:30

Calling a javascript function in an aspx page is a general scenario but calling the same function from code behind and registering a javascript in the code behind and dynamically calling that function is something new and have to learn. So in this article you can find out different scenarios of calling a javascript function.

1. Calling a javascript function from aspx page (general way)

2. Calling a javascript function from code behind

3. Registering a javascript function dynamically and calling it through an event.

4. Dynamically calling a dynamically registered javascript function.

ASPX PAGE:

In the aspx page we can simply writes the code like as following and in an any events of control we can fire the function.

Default.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

function CallingFun()

{

alert('Hi, Iam javascript function. Calling from asp.net');

}

function test()

{

alert('Hi, This is from button(general way)’);

}

</script>

</head>

<body>

<div>

<%--calling test function here--%>

<%--calling testing function which is dynamically registered from code behind--%>

</div>

</form>

</body>

</html>

Code Behind:

using System;

using System.Web.UI;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

javaScript();

System.Web.UI.ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), "Script", "CallingFun();", true);

}

private void javaScript()

{

string script = @"<script type=""text/javascript"" language=""Javascript"">

function testing()

{

alert('Hey Dude, Im from code behind');

}

</script>";

Page.ClientScript.RegisterClientScriptBlock(GetType(), "sivagtest", script);

}

Implementing Multiple Interfaces which have same method name and same signature in C#

2013-08-26T20:06:00.002+05:30

n C#, we cannot inherit multiple classes but we can accomplish multiple inheritance through interfaces. That means we can implement multiple interfaces.

There are some situations where we have requirement to implement multiple interfaces which has method same name and same signature. In this scenario, we cannot find which interface method class implements. To solve this issue, you have to mention interface name before the method name whenever you are implementing the interface method in class.

For example you have two interfaces EmpInterface1, EmpInterface2 which method empName() with the same signature as shown below.

interface EmpInterface1

{

string empName();

}

interface EmpInterface2

{

string empName();

}

Now whenever you are implementing the these two interfaces mention interface name also before the method name as shown below.

class Employee:EmpInterface1,EmpInterface2

{

#region EmpInterface1 Members

string EmpInterface1.empName()

{

return "ABC";

}

#endregion

#region EmpInterface2 Members

string EmpInterface2.empName()

{

return "DEF";

}

#endregion

}

As shown above, we are implementing the EmpInterface1 empName() method as EmpInterface1.empName() and EmpInterface2 empName() method as EmpInterface2.empName().

To access these two methods from client through by creating the object for Employee class and access this object through EmpInterface1 and EmpInterface2 interfaces as shown below.

class Program

{

static void Main(string[] args)

{

EmpInterface1 objEmp1 = new Employee();

EmpInterface2 objEmp2 = new Employee();

Console.WriteLine("EmpInterface1 empName() method result: {0} \nEmpInterface2 empName() method result: {1}", objEmp1.empName(), objEmp2.empName());

Console.ReadLine();

}

Here you are accessing the EmpInterface1 empName() method through EmpInterface1 reference and EmpInterface2 empName() method through EmpInterface2 reference.

The output displays as shown below.

Pass By Value and Pass By Reference in C#

2013-08-26T19:56:00.002+05:30

In C#, when argument is passed by value, the called method receives the copy of the variable value while argument is passed by reference the called method receives only reference not value.

In the case of Pass by value in C# called method cannot change the received variable value because it receives value. In the case of Pass by reference the called method can change the received variable value because it receives reference and in the case of pass of pass by reference only one copy of variable value is maintained, only references are passed to called methods. But in the case of pass by value the number of copy variable value is depend on the number of called methods, that means if there are five called methods then there are five copies are maintained.

Pass By Value in C#:

using System;

namespace CSharpPassByValueReference

{

class Program

{

static void Main(string[] args)

{

int j = 10;

Console.WriteLine("Before Pass By Value: " + j.ToString());

Display(j);

Console.WriteLine("After Pass By Value: " + j.ToString());

Console.ReadLine();

}

private static void Display(int i)

{

i = 20;

}

As shown above, we are passing the arguments to the Display() method by value and the output is as shown below.

As output shown, the value of the passed variable is same before and after calling the method in the case of pass by value.

Pass By Reference in C#:

using System;

namespace CSharpPassByValueReference

{

class Program

{

static void Main(string[] args)

{

int j = 10;

Console.WriteLine("Before Pass By Value: " + j.ToString());

Display(ref j);

Console.WriteLine("After Pass By Value: " + j.ToString());

Console.ReadLine();

}

private static void Display(ref int i)

{

i = 20;

}

As shown above, we are passing the arguments to the Display() method by ref and the output is as shown below.

As output shown, the value of the passed variable is different before and after calling the method in the case of pass by reference.