I was thinking these emails will help me resolve my issue but seems like they are not working. Can you please direct me to the right links.

AllowSorting should be set to Yes (on server) as opposed to OnClient.

Alex,

I got the same problem. Could you specify how to postback and where to postback in this case?

Thanks

Hi Alex,

Thank you for getting back to me.  I looked at the post you sent me and rather than creating my own sorting algorithm I decided to return another column when databinding and sorting by that field. 

protected void UltraWebGrid1_SortColumn(object sender, Infragistics.WebUI.UltraWebGrid.SortColumnEventArgs e)
{

     //Save();
     e.Cancel = true;
     Session["Sort"] = "True";
     Session["SortColumn"] = e.ColumnNo - 1;
}

Then to get it to sort I did the following in the Page_PreRender method:

                      UltraWebGrid.Bands[0].SortedColumns.Add(UltraWebGrid.DisplayLayout.Bands[0].Columns[Convert.ToInt32(Session["SortColumn"])]);

                   for (int y = 0; y < UltraWebGrid.Bands[0].SortedColumns.Count; y++)
                   {
                        if (UltraWebGrid.Bands[0].SortedColumns[y].Key != UltraWebGrid.DisplayLayout.Bands[0].Columns[Convert.ToInt32(Session["SortColumn"])].Key)
                               UltraWebGrid.Bands[0].SortedColumns.RemoveAt(y);
                   }                    
                    UltraWebGrid.DataSource = dv;
                    UltraWebGrid.DataBind();
                }
          }
     break;
     default:     break;
     }
}

This seems to work alright.  The problem I am having now is if I uncomment the Save() method call in UltraWebGrid1_SortColumn then I get a null reference error.  The stack trace is below:

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.UpdateDBRow(UltraGridRow row, UltraGridRow oldRow) +155
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.ProcessChanges(StateChanges stateChanges, Boolean fireEvents) +1557
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.RaisePostDataChangedEvent() +161
   System.Web.UI.Page.RaiseChangedEvents() +165
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485

Please at your earliest convience can you help me troubleshoot this?   Is this a bug in the UltraWebGrid?

 Thanks in advance,

 Dan