FileStream FS = new FileStream(@"E:\Pictures\Animal\a.gif",FileMode.Open,FileAccess.Read);
            
            byte[] buff = new byte[FS.Length+1];
            
            int i = FS.Read(buff,0,(int)FS.Length);

            if( i<FS.Length)
            {
                Response.Write("Error");
            }

                                    
            Response.ContentType = "image/gif";
            
            Response.BinaryWrite(buff);