making thumbnil in asp.net

public class MakeThumbnail : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)

{

// get the file name -- fall800.jpg
string file = Request.QueryString["file"];

// create an image object, using the filename we just retrieved
System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(file));

// create the actual thumbnail image
System.Drawing.Image thumbnailImage = image.GetThumbnailImage(160, 120, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);

// make a memory stream to work with the image bytes
MemoryStream imageStream = new MemoryStream();

// put the image into the memory stream
thumbnailImage.Save(imageStream, System.Drawing.Imaging.ImageFormat.Jpeg);//Imaging.Imageformat.Jpeg);

// make byte array the same size as the image
byte[] imageContent = new Byte[imageStream.Length];

// rewind the memory stream
imageStream.Position = 0;

// load the byte array with the image
imageStream.Read(imageContent, 0, (int)imageStream.Length);

// return byte array to caller with image type
Response.ContentType = "image/jpeg";
Response.BinaryWrite(imageContent);
}
public bool ThumbnailCallback()
{
return true;
}

HTML tag
img src='wallpaper/MakeThumbnail.aspx?file=<%# DataBinder.Eval(Container.DataItem,"image_path") %>'