code is working plz check..................

string strImageName = TextBox1.Text.ToString();
       if (!object.Equals(Session["Id"], null))
       {
           if (Object.Equals(Session["Id"], Request.QueryString["Id"].ToString()))
           {
               if (FileUpload2.HasFile)
               {
                   string ImageName = FileUpload2.PostedFile.FileName;
                   string sImageFileExtension = ImageName.Substring(ImageName.LastIndexOf(".")).ToLower();
                   if (sImageFileExtension == ".Gif" || sImageFileExtension == ".png" || sImageFileExtension == ".jpg" || sImageFileExtension == ".jpeg" || sImageFileExtension == ".bmp")
                   {
                       // int length = FileUpload1.PostedFile.ContentLength;
                       //    string strExtension = System.IO.Path.GetExtension(FileUpload1.FileName);
                       //  if ((strExtension.ToUpper() == ".JPG") | (strExtension.ToUpper() == ".GIF"))

                       // Resize Image Before Uploading to DataBase
                       System.Drawing.Image imageToBeResized = System.Drawing.Image.FromStream(FileUpload2.PostedFile.InputStream);

                       int imageHeight = imageToBeResized.Height;
                       int imageWidth = imageToBeResized.Width;
                       int maxHeight = 450;
                       int maxWidth = 320;
                       if (imageWidth > maxWidth)
                       {
                           imageHeight = (imageHeight * maxWidth) / imageWidth;
                           imageWidth = maxWidth;
                       }
                       if (imageHeight > maxHeight)
                       {
                           imageWidth = (imageWidth * maxHeight) / imageHeight;
                           imageHeight = maxHeight;
                       }
                       Bitmap bitmap = new Bitmap(imageToBeResized, imageWidth, imageHeight);//existing image Scaled to the specified size
                       System.IO.MemoryStream stream = new MemoryStream();
                       bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                       bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Gif);here is problem may  be image Gif format is not supported
                       stream.Position = 0;

                       //create a byte array to store the binary image data
                       byte[] image = new byte[stream.Length + 1];
                       //set the binary data
                       stream.Read(image, 0, image.Length);
                       SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\omar\Documents\Visual Studio 2005\WebSites\Project2\App_Data\Database.mdf;Integrated Security=True;User Instance=True");
                       string que = "insert into Pictures(Id,ImageName,Image)values('" + Session["Id"] + "',@imagename,@image )";
                       SqlCommand com = new SqlCommand(que, con);
                       com.Parameters.Add("@imagename", SqlDbType.VarChar, 500);
                       com.Parameters.Add("@image", SqlDbType.Image, image.Length);
                       // com.Parameters.Add("@image1", SqlDbType.Image, image.Length);
                       com.Parameters["@imagename"].Value = strImageName.ToString();
                       com.Parameters["@image"].Value = image;
                       // com.Parameters["@image1"].Value = image;
                       con.Open();
                       com.ExecuteNonQuery();
                       con.Close();
                       // Response.Redirect("Default3.aspx");
                       //Response.Redirect("UserDetails.aspx");
                   }
               }
           }
       }
   }

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Data.SqlClient;
using System.Configuration;
public class Handler : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\omar\Documents\Visual Studio 2005\WebSites\Project2\App_Data\Database.mdf;Integrated Security=True;User Instance=True");
       // con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        // Create SQL Command 
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "Select Image from Pictures where ImgId =@ImgId";
        cmd.CommandType = System.Data.CommandType.Text;
        cmd.Connection = con;
        SqlParameter ImageID = new SqlParameter("@ImgId", System.Data.SqlDbType.Int);
        ImageID.Value = context.Request.QueryString["ImgId"];
        cmd.Parameters.Add(ImageID);
        con.Open();
       // int intImg = Convert.ToInt32(context.Request.QueryString["img"]);
        SqlDataReader dReader = cmd.ExecuteReader();
        dReader.Read();
        context.Response.BinaryWrite((byte[])dReader["Image"]);
        dReader.Close();
  
        con.Close();
   
    }