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                    String StrName = System.IO.Path.GetFileName(TObj.ClientFilePath);
                    String StrPath = MapPath(Request.ApplicationPath + TObj.VirtualFilePath);

                    FileStream fileStream=new FileStream(StrPath, FileMode.Open); 
                    long fileSize = fileStream.Length; 
                    Context.Response.ContentType="application/octet-steam"; 
                    Context.Response.AddHeader("Content-Disposition","attachment; filename=\"" + HttpUtility.UrlEncode(StrName, System.Text.Encoding.UTF8) + "\";"); 
                    Context.Response.AddHeader("Content-Length",fileSize.ToString()); 
                    byte[] fileBuffer=new byte[fileSize]; 
                    fileStream.Read(fileBuffer, 0, (int)fileSize); 
                    Context.Response.BinaryWrite(fileBuffer); 
                    Context.Response.End();