It works fine for AutoGenerated edit form, but not for template form. To reproduce the problem, just paste the following code after closing columns tag (</COLUMNS>):
The returned error is:
You have specified that your update command compares all values on SqlDataSource 'SqlDataSource1', but the dictionary passed in for oldValues is empty. Pass in a valid dictionary for update or change your mode to OverwriteChanges.
I see only one example with edit form template on your web site, and that one is using non-standard data source and is visualy very difficult to follow. Not to mention dirty code with ? instead of parameter names and non-maximisable code window. Link: http://demos.telerik.com/ASPNET/Prometheus/Grid/Examples/DataEditing/TemplateFormUpdate/DefaultCS.aspx
Please let me know how to use custom template form for automatic operations.