How to make corp and thumbnail of any size of image in C#, ASP.NET

With out loosing clarity of the image you can get it by given two method, In my case I had to upload the image in the server and show them in the gallery...

protected void btnUpload_Click(object sender, EventArgs e)
{
// Initialize variables
string sSavePath;
string sThumbExtension;
int intThumbWidth;
int intThumbHeight;

// Set constant values

sSavePath = "uploadedImages/";
sThumbExtension = "_thumb";
intThumbWidth = 160;
intThumbHeight = 120;

// If file field is not empty

if (fileUploader.PostedFile != null)
{
// Check file size (must not be 0)

HttpPostedFile myFile = fileUploader.PostedFile;
int nFileLen = myFile.ContentLength;
if (nFileLen == 0)
{
lblOutput.Visible = true;
lblOutput.Text = "No file was uploaded.";
return;
}

// Check file extension (must be JPG)

if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".jpg")
{
lblOutput.Visible = true;
lblOutput.Text = "The file must have an extension of JPG";
return;
}

// Read file into a data stream

byte[] myData = new Byte[nFileLen];
myFile.InputStream.Read(myData, 0, nFileLen);

// Make sure a duplicate file does not exist.  If it does, keep on appending an 

// incremental numeric until it is unique

string sFilename = System.IO.Path.GetFileName(myFile.FileName);

int file_append = 0;
while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
{
file_append++;
sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
+ file_append.ToString() + ".jpg";
}

// Save the stream to disk

System.IO.FileStream newFile
= new System.IO.FileStream(Server.MapPath(sSavePath + sFilename),
System.IO.FileMode.Create);
newFile.Write(myData, 0, myData.Length);
newFile.Close();

// Check whether the file is really a JPEG by opening it

System.Drawing.Image.GetThumbnailImageAbort myCallBack =
new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
Bitmap myBitmap;
try
{
myBitmap = new Bitmap(Server.MapPath(sSavePath + sFilename));

// If jpg file is a jpeg, create a thumbnail filename that is unique.

file_append = 0;
string sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
+ sThumbExtension + ".jpg";
while (System.IO.File.Exists(Server.MapPath(sSavePath + sThumbFile)))
{
file_append++;
sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
file_append.ToString() + sThumbExtension + ".jpg";
}

// Save thumbnail and output it onto the webpage

System.Drawing.Image myThumbnail
= myBitmap.GetThumbnailImage(intThumbWidth,
intThumbHeight, myCallBack, IntPtr.Zero);
myThumbnail.Save(Server.MapPath(sSavePath + sThumbFile));
filename = sThumbFile;
imgUser.ImageUrl = sSavePath + sThumbFile;
fileURL = sSavePath + sThumbFile;
// Displaying success information
lblOutput.Visible = true;
lblOutput.Text = "File uploaded successfully!";

// Destroy objects

myThumbnail.Dispose();
myBitmap.Dispose();
}
catch (ArgumentException errArgument)
{
// The file wasn't a valid jpg file
lblOutput.Visible = true;
lblOutput.Text = "The file wasn't a valid jpg file.";
System.IO.File.Delete(Server.MapPath(sSavePath + sFilename));
}
}

}

Next...

public bool ThumbnailCallback()
{
return false;
}

Thats all...