title: how to download binary data from RadGridAttachmentColumn?
body: <p><strong>My code</strong></p>
  
  <pre><code>protected void grdFiles_ItemCommand(object source, GridCommandEventArgs e)
        {
            if (e.CommandName == RadGrid.DownloadAttachmentCommandName)
             {
  
                  GridDownloadAttachmentCommandEventArgs args = e as GridDownloadAttachmentCommandEventArgs;
                  string fileName = args.FileName;
                  int attachmentId = (int)args.AttachmentKeyValues["ProjectFileId"];
  
                  ProTrakEntities objEntity = new ProTrakEntities();
                  ProjectFile objFile = (from type in objEntity.ProjectFiles where type.ProjectFileId == attachmentId select type).First();
                  string filename = objFile.FileName;
                  string Filetype = objFile.FileType;
                  byte[] binaryData = (byte[])objFile.FileData;
                  //byte[] binaryData = (byte[])data.Tables[0].Rows[0]["BinaryData"];
                 // Response.AppendHeader("Content-Disposition", "attachment; filename = "+filename);
                 // Response.AppendHeader("Content-Length", filename.Length.ToString());
                 //Response.ContentType = Filetype;
                 //Response.WriteFile(Server.MapPath("Uploads/"+filename));
                 //Response.Flush();
                 //Response.Close();
                 //Response.End();
  
  
                 // grdFiles.Items[0].FireCommandEvent(RadGrid.DownloadAttachmentCommandName, parameters);
                  Response.Clear();
                  Response.ContentType = Filetype;
                  Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
                  Response.BinaryWrite(binaryData);
                  Response.End();
  
          }
      }
  </code></pre>
  
  <p>When i debugging the uploaded data converted to binary data and saved in Database.I can download from local client.but not working when downloading from server side. </p>