Resizing image on the fly!

public partial class Thumbnail : System.Web.UI.Page
{
 const string Q_IMG = "img";
 const string Q_WIDTH = "w";
 const string Q_HEIGHT = "h";

 const int DEFAULT_WIDTH = 120;
 const int DEFAULT_HEIGHT = 118;

 int Thumbnail_Width
 {
     get
     {
         if (Request.QueryString[Q_WIDTH] != null)
         return Convert.ToInt32(Request.QueryString[Q_WIDTH]);
         else
         return DEFAULT_WIDTH;
     }
 }

 int Thumbnail_Height
 {
     get
     {
         if (Request.QueryString[Q_HEIGHT] != null)
         return Convert.ToInt32(Request.QueryString[Q_HEIGHT]);
         else
         return DEFAULT_HEIGHT;
     }
 }

 ///
 /// just a dummy delegate for the required GetThumbnailImageAbort delegate
 ///
 ///
 public bool ImgAbort_Callback()
 {
     return false;
 }


 protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         if (Request.QueryString[Q_IMG] != null)
         {
             try
             {
                 using (System.Drawing.Image img = System.Drawing.Image.FromFile(Server.MapPath(Request.QueryString[Q_IMG])))
                 {
                     using (System.Drawing.Image thumb = img.GetThumbnailImage(
                     this.Thumbnail_Width,
                     this.Thumbnail_Height,
                     new System.Drawing.Image.GetThumbnailImageAbort(ImgAbort_Callback),
                     IntPtr.Zero))
                     {
                         Response.ContentType = "image/jpeg";
                         thumb.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                     }
                 }
             }
             catch { }
         }
     }
 }
}

Resizing image on the fly!