public void GetDelivery(DateTime dtBegin, DateTime dtEnd)
 {
     try
     {
         var objManifest = new WSManifest.SwiftExpressWSManifest();
         var pResult     = "";
         var ds          = objManifest.GetDelivery(Session["connectionString"].ToString(), dtBegin, dtEnd, ref pResult);
         if (pResult == "")
         {
             ASPxGridView1.DataSource = ds;
             ASPxGridView1.DataBind();
             Session["DATA_DELIVERY"] = ds;
         }
         else
         {
             ScriptManager.RegisterStartupScript(this, GetType(), "ErrorText", "CallError('" + pResult + "');", true);
         }
         objManifest.Dispose();
     }
     catch (Exception ex)
     {
         ScriptManager.RegisterStartupScript(this, GetType(), "ErrorText", "CallError('Error: " + ex.Message + "');", true);
     }
 }