GURU of .Net

Googling Techniques

2012-11-17T03:17:00.000-08:00

Googling Techniques – Easy & Effective

When I do searching with Google, many times I feel to have more effective search or wish to know some techniques with which it is possible to get more relative results which I am looking for.

Today going to share few of the techniques which I came to know.

First let us talk, How Google interprets basic search?

Google places “AND” operator between all search term(s) entered i.e. if one searches for News Reader, Google interprets it as News AND Reader.

Also it automatically searches for some plural/singular and grammatical variants i.e. for search of News Reader, Google searches for News AND Reader OR Readers.

What if one wishes to search “News Reader” exactly as entered?

Well in that case one must not put the word News Reader as it is but to put it in quotation marks i.e. “News Reader”. Now Google will not search for News AND Reader OR Reader but it will search for News Reader as it is entered.

Now one wishes to search something and all the matching/relative terms

Well let’s take an example that one is searching ItemX and wishes Google to show all the other IT companies as ItemX is. Use “~” (tilled) sign to do so i.e. search ~ItemX and Google will get all about ItemX as well as other IT companies.

One is looking for specific file type, how to search?

OK, now say one is looking for either pdf, docx, ico, ppt, xls or any other specific file type. To get exact result say one need to get Microsoft .Net MVC4 e-book in pdf format for this search should be – “Microsoft .Net MVC4″ filetype:pdf. Now search result will get all the pdf files with expected search term.

What, you wish to search but excluding some results?

Many times one feels that let me search some term but it should exclude specific term i.e. let’s say I wish to search for Nano but don’t wish to get search result related to Nano Car.

Here is the technique, search term should be – nano -car, now it will not give search result for Nano Car.

What if one wish to search something on specific site?

Smile, Google is ready with solution. Write the term to search with post-fix site:domain.com i.e. say one wishes to search for Bajaj on moneycontrol.com now search box will be filled by – site: e.g. bajaj site:moneycontrol.com

OK good, now one wishes to search all the sites which links to a particular site

Hmmm, I am thinking of a person looking for all the sites which links to reliance.com. The one should enter search phrase as – link: e.g. link:reliance.com

Oh, so you have found a site and wish to find other sites like that?

Hey, I found a nice online shopping site and wish to get all the sites those are there for online shopping. No problem, just search with – related: e.g. related:flipkart.com

Looking for a definition?

Search – define: e.g. define:knowledge

Want to get calculation result?

Just write the expression in search box and woohooo here is the result – (1+2) * 8 / 3 = ?? or (sqrt 64) = ??.

Now is the limit, unit conversion?

OK OK, it will do unit conversion also… Here you go, 1 USD in INR, 1 pound in kg, 1 mile in km

More search operators

allinanchor:
allintext:
allintitle:
allinurl:
cache:
group:
info:
time
weather

To get movie information

http://www.google.co.in/movies

Google hack for finding direct links

warning: do not try this in office or workplace.

So say one is looking for specific video. Search in Google and go to site where whole webpage will load, find the link, click it, may be more than one clicks required… too much, right?

Search like this – intitle:”index.of”(mp3|mp4|avi|mpeg) indian fusion – this will give all the sites and on click of it one will get direct link to specific file rather than going on to the webpage and moving around.

Cooool, well I like that !!!

Wish to get Trends information?

Go to: http://www.google.co.in/trends/ – check out the information really helpful to get market and people trends and history for the same.

Keep searching… Happy Googling… more efficiently

Payment Gateway

2010-07-01T02:55:00.000-07:00

The payment gateway integration in .Net sometime become headache.

1. Most of the time we come across question , which payment gateway to choose.

2. Among the gateway also , multiple version available. Which version to go with.

3. Which one is more secure and easy to implement.

4. Which gateway provide maximum information to integrate in the site.

Well , i will soon come with my solutions and comments on the payment gateways and correct version selection.

Send Email - Desktop Environment - C#

2008-09-30T05:45:00.000-07:00

include name space "using System.Net.Mail;"

make function say sendmail in that,

sendmail()
{

// Details of SMTP server.
SmtpClient MailObj= new SmtpClient(SMTP_Server);

//Define USER ID and Password for SMTP Server Account
NetworkCredential cred = new NetworkCredential(SMTP_Authentication_User, SMTP_Authentication_Password);

//Assign that Credentials to Mail Object
MailObj.Credentials = cred;

//Define the email details as below.
//Note that multiple email address for to can be given by "," sign
MailObj.Send(from, to, subject, body);

}

Custom Error Handling

2008-08-19T03:41:00.000-07:00

To handle error manully and redirect user on particular page/pages
syntac is ,

Grid - Code Approach

2008-08-06T04:49:00.000-07:00

This code handle the grid. Manual with code approach Edit,delete records from grid.

Create table with following columns

Eno bigint - autoincrement
name varchar(100)
salary bigint

ASPX.cs Code - default.aspx.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings.Get("cn").ToString());

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (cn.State != ConnectionState.Open)
{
cn.Open();
}

bindgrid();
}
}
private void bindgrid()
{
SqlDataAdapter ad = new SqlDataAdapter("select * from emp", cn);
DataSet ds = new DataSet();
ad.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
bindgrid();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{

Label lbleno = (Label)GridView1.Rows[e.RowIndex].FindControl("lbl_eno");
TextBox txtname = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txt_name");
TextBox txtsalary = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txt_salary");

if (cn.State != ConnectionState.Open)
{
cn.Open();
}

SqlCommand cmd = new SqlCommand("update emp set name='" + txtname.Text + "',salary=" + txtsalary.Text + " where eno=" + lbleno.Text, cn);
cmd.ExecuteNonQuery();
GridView1.EditIndex = -1;
bindgrid();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{

Label lbleno = (Label)GridView1.Rows[e.RowIndex].FindControl("lbl_no");

if (cn.State != ConnectionState.Open)
{
cn.Open();
}

SqlCommand cmd = new SqlCommand("delete from emp where eno=" + lbleno.Text, cn);
cmd.ExecuteNonQuery();
GridView1.EditIndex = -1;
bindgrid();
}
}

Thumbnails-Part1

2008-07-21T22:44:00.000-07:00

High resolution thumbnails with dynamic width and height

This code will check the image original height and width and accordingly will create the
thumb by setting its suitable thumb height and width. Will give high resolution thumb and
also image will not be blur or squeeze. Name space needed

using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

Path - path of original file where located
Width,height - will be supplied as perameter.
Will create new thumbnail on c:\hello.jpg

System.Drawing.Image img = System.Drawing.Image.FromFile(Path);
int srcWidth = img.Width;
int srcHeight = img.Height;
Decimal sizeRatio = ((Decimal)srcHeight / srcWidth);
height = Decimal.ToInt32(sizeRatio * width);
if (height > 250)
height = 250;

Size sz = new Size(width, height);
using (Bitmap bmp = new Bitmap(Path))
{
using (Bitmap bmpThumb = new Bitmap((System.Drawing.Image)bmp, sz))
{
using (Graphics grp = Graphics.FromImage(bmpThumb))
{
grp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
grp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
grp.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

System.Drawing.Imaging.ImageCodecInfo codec = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders()[1];

System.Drawing.Imaging.EncoderParameters eParams = new System.Drawing.Imaging.EncoderParameters(1);
eParams.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

grp.DrawImage(bmp, new Rectangle(0, 0, bmpThumb.Width, bmpThumb.Height));

string strDestPath = "c:\\hello.jpg"; // you can give your path where you want to create file

bmpThumb.Save(strDestPath, codec, eParams);

}
}
}

Silverlight Player - Part 1

2008-07-21T22:30:00.000-07:00

Silverlight 2.0 - Part2

2008-07-18T02:05:00.000-07:00

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Resources;
using System.Windows.Shapes;
using System.Net;
using System.Windows.Media.Imaging;
using System.IO;
using System.Text;
using System.Windows.Threading;

namespace Video_Dialog
{
public partial class Page : UserControl
{
private DispatcherTimer timer;
private bool IsVideoScrubberLocked { get; set; }
OpenFileDialog dlg = new OpenFileDialog();
private double unmutedVolume;

public Page()
{
InitializeComponent();

timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(50);
timer.Tick += new EventHandler(timer_Tick);

sliderScrubber.MouseLeftButtonUp += new MouseButtonEventHandler(sliderScrubber_MouseLeftButtonUp);
sliderScrubber.MouseLeftButtonDown += new MouseButtonEventHandler(sliderScrubber_MouseLeftButtonDown);

sliderVolume.ValueChanged += new RoutedPropertyChangedEventHandler(sliderVolume_ValueChanged);

}

void MyVideo_MediaOpened(object sender, RoutedEventArgs e)
{
sliderVolume.Value = MyVideo.Volume;
}

void sliderVolume_ValueChanged(object sender, RoutedPropertyChangedEventArgs e)
{
MyVideo.Volume = sliderVolume.Value;
}

void sliderScrubber_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
IsVideoScrubberLocked = true;
}

void sliderScrubber_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
IsVideoScrubberLocked = false;
MyVideo.Position = TimeSpan.FromMilliseconds(
MyVideo.NaturalDuration.TimeSpan.TotalMilliseconds * sliderScrubber.Value);
}

void timer_Tick(object sender, EventArgs e)
{
if (MyVideo.NaturalDuration.TimeSpan.TotalSeconds > 0 && !IsVideoScrubberLocked)
{
txtVideoPosition.Text =
string.Format("{0:00}:{1:00}", MyVideo.Position.Minutes, MyVideo.Position.Seconds);

sliderScrubber.Value = MyVideo.Position.TotalSeconds /
MyVideo.NaturalDuration.TimeSpan.TotalSeconds;
}
}

void MyVideo_CurrentStateChanged(object sender, RoutedEventArgs e)
{
if (MyVideo.CurrentState == MediaElementState.Playing)
{
timer.Start();
}
else
{
timer.Stop();
}
}
private void btReadFile_Click(object sender, RoutedEventArgs e)
{

dlg.Filter = "MP3 Files (*.mp3)|*.mp3|WMA Files (*.wma)|*.wma|Wmv Files (*.wmv)|*.wmv";
dlg.Multiselect = false;

// Show the open file dialog
dlg.ShowDialog();

}

private void btnPlayPause_Click(object sender, RoutedEventArgs e)
{
MyVideo.Pause();
}

private void btnPlay_Click(object sender, RoutedEventArgs e)
{
if (dlg.SelectedFile != null)
{
// Set the source as the local file

MyVideo.SetSource(dlg.SelectedFile.OpenRead());
}
MyVideo.Play();
}

private void btnMute_Click(object sender, RoutedEventArgs e)
{
MyVideo.Volume = 0;
}
}

}

Cookies,Session

2008-07-07T07:29:00.000-07:00

Purpose - Accessing session,cookies in your class files.

say,
I am using one global function that check that wether user session is
expired or not in that case i have created one class file. Now to access
values of session in the class file i can call the function like

cls_Check_Sessoin objSession=new cls_Check_Sessoin();

protected void Page_Load(object sender, EventArgs e)
{

if(objSession.IsAuthenticated(this.Context))
{
some porocess code;
}
else
{
Response.Redirect("Login.aspx");// will be called if session is expired
}

}

//-------------------In my class file i have function that check the page session
//--values like

public static bool IsAuthenticated(HttpContext context)
{

if (context.Session["User"] == null)
{
return false;
}
else
{
return true;
}

}

Thumbnails-Part2

2008-07-07T03:32:00.001-07:00

Need to include following name spaces
using System.Drawing;
using System.Drawing.Drawing2D;

-------------Code-------------

int width=200;
int height=200;

string Path=server.mappath(".") + "\\UploadPhotos\\hello_old.jpg";

System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile(Path);

Bitmap SmallBitmap = new Bitmap(width, height, OriginalImage.PixelFormat);
Graphics SmallImg = Graphics.FromImage(SmallBitmap);

SmallImg.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

SmallImg.DrawImage(OriginalImage, 0, 0, SmallBitmap.Width, SmallBitmap.Height);

//Print to the browser
context.Response.ContentType = "image/jpeg";
SmallBitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

string NewFileName = "";

SmallBitmap.Save(server.mappath(".") + ""\\UploadPhotos\\hello.jpg", ImageFormat.Jpeg);
SmallImg.Dispose();
SmallImg.Dispose();

To get IP Address

2008-07-07T03:25:00.000-07:00

object obj = new object();

obj = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (obj == null)
{
obj = Request.ServerVariables["REMOTE_ADDR"];
}

Encryption Decryption - ASP .Net , C#

2008-07-07T03:19:00.000-07:00

Decryption Code

string passPhrase = "DevNetCor"; // can be any string
string saltValue = "test@key"; // can be any string
string hashAlgorithm = "MD5"; // can be "MD5"
int passwordIterations = 2; // can be any number
string initVector = "@1B2c3D4e5F6g7H8"; // must be 16 bytes
int keySize = 256; // can be 192 or 128

// Convert strings defining encryption key characteristics into byte
// arrays. Let us assume that strings only contain ASCII codes.
// If strings include Unicode characters, use Unicode, UTF7, or UTF8
// encoding.
byte[] initVectorBytes = System.Text.Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = System.Text.Encoding.ASCII.GetBytes(saltValue);

// Convert our ciphertext into a byte array.
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);

// First, we must create a password, from which the key will be
// derived. This password will be generated from the specified
// passphrase and salt value. The password will be created using
// the specified hash algorithm. Password creation can be done in
// several iterations.
PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);

// Use the password to generate pseudo-random bytes for the encryption
// key. Specify the size of the key in bytes (instead of bits).
byte[] keyBytes = password.GetBytes(keySize / 8);

// Create uninitialized Rijndael encryption object.
RijndaelManaged symmetricKey = new RijndaelManaged();

// It is reasonable to set encryption mode to Cipher Block Chaining
// (CBC). Use default options for other symmetric key parameters.
symmetricKey.Mode = CipherMode.CBC;

// Generate decryptor from the existing key bytes and initialization
// vector. Key size will be defined based on the number of the key
// bytes.
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);

// Define memory stream which will be used to hold encrypted data.
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);

// Define cryptographic stream (always use Read mode for encryption).
CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);

// Since at this point we don't know what the size of decrypted data
// will be, allocate the buffer long enough to hold ciphertext;
// plaintext is never longer than ciphertext.
byte[] plainTextBytes = new byte[cipherTextBytes.Length];

// Start decrypting.
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);

// Close both streams.
memoryStream.Close();
cryptoStream.Close();

// Convert decrypted data into a string.
// Let us assume that the original plaintext string was UTF8-encoded.
cipherText = System.Text.Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);

--------Encryption Code

string passPhrase = "DevNetCor"; // can be any string
string saltValue = "test@key"; // can be any string
string hashAlgorithm = "MD5"; // can be "MD5"
int passwordIterations = 2; // can be any number
string initVector = "@1B2c3D4e5F6g7H8"; // must be 16 bytes
int keySize = 256; // can be 192 or 128

// Convert strings into byte arrays.
// Let us assume that strings only contain ASCII codes.
// If strings include Unicode characters, use Unicode, UTF7, or UTF8
// encoding.
byte[] initVectorBytes = System.Text.Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = System.Text.Encoding.ASCII.GetBytes(saltValue);

// Convert our plaintext into a byte array.
// Let us assume that plaintext contains UTF8-encoded characters.
byte[] plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);

// First, we must create a password, from which the key will be derived.
// This password will be generated from the specified passphrase and
// salt value. The password will be created using the specified hash
// algorithm. Password creation can be done in several iterations.
PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);

// Use the password to generate pseudo-random bytes for the encryption
// key. Specify the size of the key in bytes (instead of bits).
byte[] keyBytes = password.GetBytes(keySize / 8);

// Create uninitialized Rijndael encryption object.
RijndaelManaged symmetricKey = new RijndaelManaged();

// It is reasonable to set encryption mode to Cipher Block Chaining
// (CBC). Use default options for other symmetric key parameters.
symmetricKey.Mode = CipherMode.CBC;

// Generate encryptor from the existing key bytes and initialization
// vector. Key size will be defined based on the number of the key
// bytes.
ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);

// Define memory stream which will be used to hold encrypted data.
MemoryStream memoryStream = new MemoryStream();

// Define cryptographic stream (always use Write mode for encryption).
CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
// Start encrypting.
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);

// Finish encrypting.
cryptoStream.FlushFinalBlock();

// Convert our encrypted data from a memory stream into a byte array.
byte[] cipherTextBytes = memoryStream.ToArray();

// Close both streams.
memoryStream.Close();
cryptoStream.Close();

// Convert encrypted data into a base64-encoded string.
plainText = Convert.ToBase64String(cipherTextBytes);