ItemCreated and ItemDataBoun Cost 2 seconds(50 Items) when I Created a Column dynamic on server side in Page_Load event.

[whui]

ItemCreated and ItemDataBoun Cost 2 seconds(50 Items) when I Created a Column dynamic on server side in Page_Load event.

[whui]

My Server code as following:

GridBoundColumn boundColumn = new GridBoundColumn();
 gridTableView.Columns.Add(boundColumn);

 boundColumn.DataField = col.Field;
 boundColumn.UniqueName = uniqueName;
 boundColumn.HeaderText = col.Name;

[whui]

The reason is that I created a coloumn bound to a field which is not exist in the entity. 
thank you!