Accelerate Your Development Journey with .NET, C#, and Azure

Managing Session Integrity in .NET Core Web Applications: A Middleware Approach

2024-01-23T09:37:00.000-08:00

In our journey of developing a .NET Core web application, we encountered a peculiar challenge with our time-tracking feature. The application worked seamlessly in a single tab, but issues arose when users attempted to use it in multiple tabs or windows.

Opening the application in multiple tabs caused the timer to aggregate time across all instances, leading to unexpected behavior. If, for instance, the application was opened in five tabs, it would log 5 minutes instead of the intended 1 minute after 1 minute had passed.

To address this behavior, we aimed to implement a solution that would log out the previous session when more than one instance of the application was opened. We explored various options, including handling it with JavaScript or creating a custom attribute, but ultimately settled on using custom middleware.

Why middleware, you ask? The primary reason is that the middleware's function executes for every request, providing us with a robust solution. So, what did we include in our middleware?

Upon a user's initial login, we store their email and Bearer Token in an SQL table. Subsequent logins generate a new Bearer Token, allowing us to track sessions. The middleware checks the combination of Email and Bearer Token by querying the table. If a record is found, we assume the request is from the same tab. However, if a user logs in from a new tab, a new Bearer Token is generated. Querying the database with this new token results in no rows, prompting us to replace the table entry with the new Bearer Token, thus allowing access to the application.

This middleware-based approach ensures session integrity by handling multiple instances, providing a seamless user experience while maintaining the expected behavior. If a user returns to a previous tab with an expired session, the middleware gracefully handles it by returning a 401 status, effectively logging out the user.

Below is the source code

Entity Framework Core Seed

2020-06-02T00:07:00.001-07:00

Whenever we create our database using model classes in entity framework core, after initial or first migration our database tables remains empty.

We can seed or insert initial data by using below steps.

Create Model Class.

In first step we have created our model class

Create Connection String

Open appsettings.json file and add ConnectionStrings like mentioned below

Refer model in DbConectext class

First Migration

Next we will open Package Manager console (View >> Other Windows >> Package Manager Console. Once Package Manager console is launched we will execute our first migration

Update Database

In next step we will run update-database command from package manager console to sync our changes with database.

Once update-database command is finished we can connect to database from Visual Studio by launching SQL Server Object Explorer ( View >> SQL Server Object Explorer)

We can found our database inside (localdb)\MSSQLLocalDB >> Database >> {{ Your Database Name }}

In above screenshot DemoDB is our database and PostModels is the name of the table

Initially PostModels table is empty

In order to create table with some initial records we use seed method.

So first we will revert our last migration.

In last step we have updated database with update-database command so we can't directly use remove-migration command here.

So first we have to query __EFMigrationsHistory table which contains all the migration.

To remove last migration(which was InitialMigration) we have to restore database to migration which was before InitialMigration (which is CreateIdentitySchema), so we will issue below mentioned command from package manager console

We have only one row in __EFMigrationsHistory table now

If we refresh our database we found that now we don't have PostModels table in database now.

Now we will open our DbConectext class and below method to create PostModels table with some initial data

In next step we will add migration follow by update-database command

Now if we check PostModels table in database then we will found it contains 2 rows.

OOPS Concepts in .NET

2013-07-10T23:58:00.004-07:00

* The object oriented programming (OOP) is a programming model

where Programs are organized around object and data rather than

action and logic.

* OOP allow decomposition of a problem into a number of entities called

Object and then builds data and function around these objects.

The Program is divided into number of small units called Object. The data and function are build around these objects.
The data of the objects can be accessed only by the functions associated with that object.
The functions of one object can access the functions of other object.

OOP has the following important features.

Class:

A class is the core of any modern Object Oriented Programming language such as C#.

In OOP languages it is must to create a class for representing data.

Class is a blueprint of an object that contains variables for storing data and functions to performing operations on these data.

Class will not occupy any memory space and hence it is only logical

representation of data.

To create a class, you simply use the keyword "class" followed by the class name:

class Employee

{

}

Object:

Objects are the basic run-time entities in an object oriented system.They may represent a person,a place or any item that the program has to handle.

"Object is a Software bundle of related variable and methods. "

“Object is an instance of a class”

Class will not occupy any memory space. Hence to work with the data represented by the class you must create a variable for the class, which is called as an object.

When an object is created by using the keyword new, then memory will be allocated for the class in heap memory area, which is called as an instance and its starting address will be stored in the object in stack memory area.

When an object is created without the keyword new, then memory will not be allocated in heap I.e. instance will not be created and object in the stack contains the value null.

When an object contains null, then it is not possible to access the members of the class using that object.

class Employee

{

}

Syntax to create an object of class Employee:-

Employee objEmp = new Employee();

All the programming languages supporting object oriented Programming will be supporting these three main concepts:

Encapsulation
Inheritance
Polymorphism

Abstraction:

Abstraction is "To represent the essential feature without representing the back ground details."

Abstraction lets you focus on what the object does instead of how it does it.

Abstraction provides you a generalized view of your classes or object by providing relevant information.

Abstraction is the process of hiding the working style of an object, and showing the information of an object in understandable manner.

Real world Example of Abstraction: -

Suppose you have an object Mobile Phone.

Suppose you have 3 mobile phones as following:-

Nokia 1400 (Features:- Calling, SMS)

Nokia 2700 (Features:- Calling, SMS, FM Radio, MP3, Camera)

Black Berry (Features:-Calling, SMS, FM Radio, MP3, Camera, Video Recording, Reading E-mails)

Abstract information (Necessary and Common Information) for the object "Mobile Phone" is make a call to any number and can send SMS."

so that, for mobile phone object you will have abstract class like following:-

abstract class MobilePhone

{

public void Calling();

public void SendSMS();

}

public class Nokia1400 : MobilePhone

{

}

public class Nokia2700 : MobilePhone

{

public void FMRadio();

public void MP3();

public void Camera();

}

public class BlackBerry : MobilePhone

{

public void FMRadio();

public void MP3();

public void Camera();

public void Recording();

public void ReadAndSendEmails();

}

Abstraction means putting all the variables and methods in a class which are necessary.

For example: - Abstract class and abstract method.

Abstraction is the common thing.

example:

If somebody in your collage tell you to fill application form, you will fill your details like name, address, data of birth, which semester, percentage you have got etc.

If some doctor gives you an application to fill the details, you will fill the details like name, address, date of birth, blood group, height and weight.

See in the above example what is the common thing?

Age, name, address so you can create the class which consist of common thing that is called abstract class.

That class is not complete and it can inherit by other class.

Encapsulation:

Wrapping up data member and method together into a single unit (i.e. Class) is called Encapsulation.

Encapsulation is like enclosing in a capsule. That is enclosing the related operations and data related to an object into that object.

Encapsulation is like your bag in which you can keep your pen, book etc. It means this is the property of encapsulating members and functions.

class Bag

{

book;

pen;

ReadBook();

}

Encapsulation means hiding the internal details of an object, i.e. how an object does something.

Encapsulation prevents clients from seeing its inside view, where the behaviour of the abstraction is implemented.

Encapsulation is a technique used to protect the information in an object from the other object.

Hide the data for security such as making the variables as private, and expose the property to access the private data which would be public.

So, when you access the property you can validate the data and set it.

Example:

class Demo

{

private int _mark;

public int Mark

{

get { return _mark; }

set { if (_mark > 0) _mark = value; else _mark = 0; }

}

Real world Example of Encapsulation:-

Let's take example of Mobile Phone and Mobile Phone Manufacturer

Suppose you are a Mobile Phone Manufacturer and you designed and developed a Mobile Phone design(class), now by using machinery you are manufacturing a Mobile Phone(object) for selling, when you sell your Mobile Phone the user only learn how to use the Mobile Phone but not that how this Mobile Phone works.

This means that you are creating the class with function and by making object (capsule) of it you are making availability of the functionality of you class by that object and without the interference in the original class.

Example-2:

TV operation

It is encapsulated with cover and we can operate with remote and no need to open TV and change the channel.

Here everything is in private except remote so that anyone can access not to operate and change the things in TV.

Inheritance:

When a class acquire the property of another class is known as inheritance.

Inheritance is process of object reusability.

For example, A Child acquire property of Parents.

public class ParentClass

{

public ParentClass()

{

Console.WriteLine("Parent Constructor.");

}

public void print()

{

Console.WriteLine("I'm a Parent Class.");

}

public class ChildClass : ParentClass

{

public ChildClass()

{

Console.WriteLine("Child Constructor.");

}

public static void Main()

{

ChildClass child = new ChildClass();

child.print();

}

Output:

    Parent Constructor.
    Child Constructor.
    I'm a Parent Class.

Polymorphism:

Polymorphism means one name many forms.

One function behaves different forms.

In other words, "Many forms of a single object is called Polymorphism."

Real World Example of Polymorphism:

Example-1:

A Teacher behaves to student.

A Teacher behaves to his/her seniors.

Here teacher is an object but attitude is different in different situation.

Example-2:

Person behaves SON in house at the same time that person behaves EMPLOYEE in office.

Example-3:

Your mobile phone, one name but many forms

As phone
As camera
As mp3 player
As radio

To Read Polmorphism in Detail click following link:-

Polymorphism in .Net

Difference between Abstraction and Encapsulation :-

Abstraction	Encapsulation
1. Abstraction solves the problem in the design level.	1. Encapsulation solves the problem in the implementation level.
2. Abstraction is used for hiding the unwanted data and giving relevant data.	2. Encapsulation means hiding the code and data into a single unit to protect the data from outside world.
3. Abstraction lets you focus on what the object does instead of how it does it	3. Encapsulation means hiding the internal details or mechanics of how an object does something.
4. Abstraction- Outer layout, used in terms of design. For Example:- Outer Look of a Mobile Phone, like it has a display screen and keypad buttons to dial a number.	4. Encapsulation- Inner layout, used in terms of implementation. For Example:- Inner Implementation detail of a Mobile Phone, how keypad button and Display Screen are connect with each other using circuits.

The easier way to understand Abstraction and encapsulation is as follows:-

Real World Example:-

Take an example of Mobile Phone:-

You have a Mobile Phone, you can dial a number using keypad buttons. Even you don't know how these are working internally. This is called Abstraction. You have the only information that is needed to dial a number. But not its internal working of mobile.

But how the Mobile Phone internally working?, how keypad buttons are connected with internal circuit? is called Encapsulation.

Summary:

"Encapsulation is accomplished by using Class. - Keeping data and methods that accesses that data into a single unit"

"Abstraction is accomplished by using Interface. - Just giving the abstract information about what it can do without specifying the back ground details"

"Information/Data hiding is accomplished by using Modifiers - By keeping the instance variables private or protected."

SQL Server Difference

2013-07-10T23:35:00.001-07:00

1.Difference between Database Mail and SQL Mail

S.No	Database Mail	SQL Mail
1	Based on SMTP (Simple Mail Transfer Protocol).	Based on MAPI (Messaging Application Programming Interface).
2	Introduced in Sql Server 2005.	Used prior versions of Sql Server 2005.
3	No need to install Outlook.	Require Outlook to be installed.
4	More secure than Sql mail.	Less secure than Database mail.

2.Difference between Azure Table storage and SQL Azure

S.No	Azure Table storage	SQL Azure
1	It is built on top of the Azure Storage platform.	It is an SQL Server that has been configured to be hosted on top of the Windows Azure in a high availability mode.
2	It comprises flexible or schema-less entities. No referential integrity between the tables, and no custom indexes.	It comprises standard SQL Tables with indexes and referential integrity.
3	It can scale massive amounts of data due to the partition key.	It may not scale as far as Azure Table storage.
4	Can be thought as single spreadsheet.	Look familiar to any .Net developer who has used Sql server 2008 prior.

3.Difference between DBMS and RDBMS

S.No	DBMS	RDBMS
1	Stands for DataBase Management System	Stands for Relational DataBase Management System
2	In dbms no relationship concept	It is used to establish the relationship concept between two database objects, i.e, tables
3	It supports Single User only	It supports multiple users
4	It treats Data as Files internally	It treats data as Tables internally
5	It supports 3 rules of E.F.CODD out off 12 rules	It supports minimum 6 rules of E.F.CODD
6	It requires low Software and Hardware Requirements.	It requires High software and hardware requirements.
7	DBMS is used for simpler business applications	RDBMS is used for more complex applications.
8	DBMS does not impose any constraints or security with regard to data manipulation	RDBMS defines the integrity constraint for the purpose of holding ACID PROPERTY
9	In DBMS Normalization process will not be present	In RDBMS, normalization process will be present to check the database table consistency
10	There is no enforcement to use foreign key concept compulsorily in DBMS	Although the foreign key concept is supported by both DBMS and RDBMS but its only RDBMS that enforces the rules
11	FoxPro, IMS are Examples	SQL Server, Oracle are examples

4.Difference between SQL Server 2000 and SQL Server 2005

S.No	SQL Server 2000	SQL Server 2005
1	Query Analyser and Enterprise manager are separate.	Both are combined as SSMS(Sql Server management Studio).
2	No XML datatype is used.	.XML datatype is introduced.
3	We can create maximum of 65,535 databases.	We can create 2(pow(20))-1 databases.
4	Exception Handling mechanism is not available	Exception Handling mechanism is available
5	There is no Varchar(Max) data type is not available	Varchar(Max) data type is introduced.
6	DDL Triggers is not available	DDL Triggers is introduced
7	DataBase Mirroring facility is not available	DataBase Mirroring facility is introduced
8	RowNumber function for paging is not available	RowNumber function for paging is introduced
9	Table fragmentation facility is not available	Table fragmentation facility is introduced
10	Full Text Search facility is not available	Full Text Search facility is introduced
11	Bulk Copy Update facility is not available	Bulk Copy Update facility is introduced
12	Data Encryption concept is not introduced	.Cannot encrypt the entire database
13	Cannot compress the tables and indexes.	Can Compress tables and indexes.(Introduced in 2005 SP2)
14	No varchar(max) or varbinary(max) is available.	Varchar(max) and varbinary(max) is used.
15	Data Transformation Services(DTS) is used as ETL tool	SQL Server Integration Services(SSIS) is started using from this SQL Server version and which is used as ETL tool

5.Difference between Database Mail and SQL Mail

S.No	Database Mail	SQL Mail
1	Based on SMTP (Simple Mail Transfer Protocol).	Based on MAPI (Messaging Application Programming Interface).
2	Introduced in Sql Server 2005.	Used prior versions of Sql Server 2005.
3	No need to install Outlook.	Require Outlook to be installed.
4	More secure than Sql mail.	Less secure than Database mail.

6.Difference between Azure Table storage and SQL Azure

S.No	Azure Table storage	SQL Azure
1	It is built on top of the Azure Storage platform.	It is an SQL Server that has been configured to be hosted on top of the Windows Azure in a high availability mode.
2	It comprises flexible or schema-less entities. No referential integrity between the tables, and no custom indexes.	It comprises standard SQL Tables with indexes and referential integrity.
3	It can scale massive amounts of data due to the partition key.	It may not scale as far as Azure Table storage.
4	Can be thought as single spreadsheet.	Look familiar to any .Net developer who has used Sql server 2008 prior.

7.Difference between DBMS and RDBMS

S.No	DBMS	RDBMS
1	Stands for DataBase Management System	Stands for Relational DataBase Management System
2	In dbms no relationship concept	It is used to establish the relationship concept between two database objects, i.e, tables
3	It supports Single User only	It supports multiple users
4	It treats Data as Files internally	It treats data as Tables internally
5	It supports 3 rules of E.F.CODD out off 12 rules	It supports minimum 6 rules of E.F.CODD
6	It requires low Software and Hardware Requirements.	It requires High software and hardware requirements.
7	DBMS is used for simpler business applications	RDBMS is used for more complex applications.
8	DBMS does not impose any constraints or security with regard to data manipulation	RDBMS defines the integrity constraint for the purpose of holding ACID PROPERTY
9	In DBMS Normalization process will not be present	In RDBMS, normalization process will be present to check the database table consistency
10	There is no enforcement to use foreign key concept compulsorily in DBMS	Although the foreign key concept is supported by both DBMS and RDBMS but its only RDBMS that enforces the rules
11	FoxPro, IMS are Examples	SQL Server, Oracle are examples

8.Difference between SQL Server 2000 and SQL Server 2005

S.No	SQL Server 2000	SQL Server 2005
1	Query Analyser and Enterprise manager are separate.	Both are combined as SSMS(Sql Server management Studio).
2	No XML datatype is used.	.XML datatype is introduced.
3	We can create maximum of 65,535 databases.	We can create 2(pow(20))-1 databases.
4	Exception Handling mechanism is not available	Exception Handling mechanism is available
5	There is no Varchar(Max) data type is not available	Varchar(Max) data type is introduced.
6	DDL Triggers is not available	DDL Triggers is introduced
7	DataBase Mirroring facility is not available	DataBase Mirroring facility is introduced
8	RowNumber function for paging is not available	RowNumber function for paging is introduced
9	Table fragmentation facility is not available	Table fragmentation facility is introduced
10	Full Text Search facility is not available	Full Text Search facility is introduced
11	Bulk Copy Update facility is not available	Bulk Copy Update facility is introduced
12	Data Encryption concept is not introduced	.Cannot encrypt the entire database
13	Cannot compress the tables and indexes.	Can Compress tables and indexes.(Introduced in 2005 SP2)
14	No varchar(max) or varbinary(max) is available.	Varchar(max) and varbinary(max) is used.
15	Data Transformation Services(DTS) is used as ETL tool	SQL Server Integration Services(SSIS) is started using from this SQL Server version and which is used as ETL tool

how to add Global.asax.cs file in asp.net or how to add Code behind file for Global.asax in asp.net

2013-07-10T03:55:00.000-07:00

I will explain how to add code behind file to Golbal.asax in asp.net. In one of my project I started writing code in Global.asax file but we decided to write code in Global.asax.cs file code I tried to search for that one but that is not available in our application at that I learn one thing that is we need to add Global.asax and Global.asax.cs these files to our application. For that one first right click on solution explorer and select Add New item

After that select Global Application class file and click ok now Global.asax file added successfully to our application

After add our Global.asax file to application that would be like this

And our Global.asax file contains code like this

<%@ Application Language="C#" %>

void Application_Start(object sender, EventArgs e)

{

// Code that runs on application startup

}

void Application_End(object sender, EventArgs e)

{

// Code that runs on application shutdown

}

void Application_Error(object sender, EventArgs e)

{

// Code that runs when an unhandled error occurs

}

void Session_Start(object sender, EventArgs e)

{

// Code that runs when a new session is started

}

void Session_End(object sender, EventArgs e)

{

// Code that runs when a session ends.

}

</script>

Now our requirement is to add Global.asax.cs file to our code for that again right click on solution explorer and select Add new item another wizard will open in that select Class file and give name as Global.asax.cs and click Add

After click Add that will show one warning message like this now click yes

After adding our Global.asax.cs file we need make some changes to use Global.asax.cs file those are first remove entire script code from your Global.asax file

---------------------------

</script>

And change this line in Global.asax file to

<%@ Application Language="C#" %>

<%@ Application Language="C#" CodeBehind="~/App_Code/global.asax.cs" Inherits="Global" %>

Now open Global.asax.cs file and change this like

public class Global

public class Global:System.Web.HttpApplication

Now write the events in Global.asax.cs file and check with break point it will work for you

Javascript Get User IP Address, Latitude, Longitude, Country, City, State Details

2013-03-17T23:43:00.002-07:00

Here I will explain how to get user current location details IP address, country, city, state, latitude and longitude using smart-ip json url in JavaScript using asp.net in C#, VB.NET.

To get current user location details I am using smart-ip.net json string to get all the information for that you need to write the following code.

<head>

<title>Get User Details IP Address, city, country, state, latitude, longitude </title>

var strip, strcountry, strcity, strregion, strlatitude, strlongitude, strtimezone

function GetUserInfo(data) {

strip = data.host; strcountry = data.countryName; strcity = data.city;

strregion = data.region; strlatitude = data.latitude; strlongitude = data.longitude;

strtimezone = data.timezone;

}

$(function () {

BindUserInfo();

})

function BindUserInfo() {

document.getElementById('lblIP').innerHTML = strip;

document.getElementById('lblCountry').innerHTML = strcountry;

document.getElementById('lblCity').innerHTML = strcity;

document.getElementById('lblregion').innerHTML = strregion;

document.getElementById('lbllatitude').innerHTML = strlatitude;

document.getElementById('lbllongitude').innerHTML = strlongitude;

document.getElementById('lbltimezone').innerHTML = strtimezone;

}

</script>

</head>

<body>

<div>

<td colspan="2" align="center">User Information</td>

</tr>

</tr>

<tr>

<td align="right"><b>Country:</b></td>

</tr>

<tr>

</tr>

<tr>

<td align="right"><b>Region:</b></td>

</tr>

<tr>

<td align="right"><b>latitude:</b></td>

</tr>

<tr>

<td align="right"><b>Longitude:</b></td>

</tr>

<tr>

</tr>

</table>

</div>

</body>

</html>

Stable DIV while asynchronous postback in ASP.NET

2012-09-22T12:57:00.000-07:00

Div Scoll during page postback.

Hello Guys,

If you have any div tag inside update panel, it got displaced during postback of page on checkbox index change or dropdown index change. I had struggled a lot for this issue.

I Found very simple one line solution for this issue

just add below line in div CSS

.DivCSS
{
position: absolute;
}

Drop all stored procedure from a database

2012-09-22T08:36:00.000-07:00

-- Using below script you can drop all stored procedure from selected database

declare @procName varchar(500)
declare cur cursor

for select [name] from sys.objects where type = 'p'
open cur
fetch next from cur into @procName
   while @@fetch_status = 0
     begin
   exec('drop procedure ' + @procName)
   fetch next from cur into @procName
    end
close cur
deallocate cur

Club Multiple Powerpoint to Single File in ASP.NET

2012-09-22T03:55:00.001-07:00

C#.NET : Merge multiple PPT into one file

protected void btnClubPPT_Click(object sender, EventArgs e)
        {
            try
            {
                    String strPath = Server.MapPath("Uploads\\");
                    String strConsolidatedPPT = Server.MapPath("SuccessStory\\");
                    string[] files = Directory.GetFiles(strPath, "*.ppt");
                    for (int i = 0; i < files.Length; i++)
                    {
                        CopySlidesFromPPT(files[i].ToString(), strConsolidatedPPT + "Consolidated Success Story.ppt");
                    }
                }
                System.Diagnostics.Process.Start(Server.MapPath("SuccessStory\\") + "Consolidated Success Story.ppt");
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                GC.Collect();
            }

public static bool CopySlidesFromPPT(string sourcefile, string dstfile)
        {
            bool success = false;

            // Create a link to the PowerPoint object model

            Microsoft.Office.Interop.PowerPoint.Application oPowerPoint = new Microsoft.Office.Interop.PowerPoint.Application ();
            Microsoft.Office.Interop.PowerPoint.Presentations oPres = oPowerPoint.Presentations;
            Microsoft.Office.Interop.PowerPoint.Presentation oPre = null;

            // If the destination presentation exists on disk, load it so
            // that we can append the new slides

            if (File.Exists(dstfile) == true)
            {
                try
                {
                    // Try and open the destination presentation
                    oPre = oPres.Open(dstfile, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse);
                }
                catch
                {
                    oPre = null;
                }
            }
            else
            {
                // Create a new presentation
                try
                {
                    oPre = oPres.Add(Microsoft.Office.Core.MsoTriState.msoFalse);
                }
                catch
                {
                    oPre = null;
                }
            }

            // Do we have a master presentation ?

            if (oPre != null)
            {
                // Point to the slides in the master presentation
                Microsoft.Office.Interop.PowerPoint.Slides oSlides = oPre.Slides;
                try
                {
                    try
                    {
                        // Open the source presentation
                        Microsoft.Office.Interop.PowerPoint.Presentation ppps = oPres.Open(sourcefile, Microsoft.Office.Core.MsoTriState.msoTrue, Microsoft.Office.Core.MsoTriState.msoTrue, Microsoft.Office.Core.MsoTriState.msoFalse);
                        try
                        {
                            // Insert the source slides onto the end of the merge presentation
                            oSlides.InsertFromFile(sourcefile, oSlides.Count, 1, ppps.Slides.Count);
                            oPre.SaveAs(dstfile, Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsDefault, Microsoft.Office.Core.MsoTriState.msoFalse);
                            // Save the merged presentation back to disk
                            // oPre.SaveAs(dstfile, Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsPresentation, Microsoft.Office.Core.MsoTriState.msoFalse);
                            // Signal success
                            success = true;
                        }
                        finally
                        {
                            // Close the source presentation
                            ppps.Close();
                        }
                    }
                    catch
                    {

                    }

                }
                finally
                {
                    // Ensure the merge presentation is closed
                    oPre.Close();
                    // Release the COM object holding the merged presentation
                    Marshal.ReleaseComObject(oPre);
                    oPre = null;
                    // Release the COM object holding the presentations
                    Marshal.ReleaseComObject(oPres);
                    oPres = null;
                    // Release the COM object holding the powerpoint application
                    Marshal.ReleaseComObject(oPowerPoint);
                    oPowerPoint = null;
                }
            }
            return success;
        }

How to Open Powerpoint file on button click in ASP.NET

2012-09-22T01:58:00.000-07:00

You can open any power point by its location on click of a button

protected void btnClubPPT_Click(object sender, EventArgs e)
        {
            try
            {
                   System.Diagnostics.Process.Start("You PPT.ppt");
             }

            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                GC.Collect();
            }