I understand that you would like the Insert Form to be different from the Edit Form, is that correct? If that is the case, you can use Custom Edit Forms
with WebUserControls for each edit mode. When the Button is clicked it fires the event Insert or Edit, and in the ItemCommand event handler, you can swap the WebUserControl used by the Grid to insert/Edit the items.
sender, GridCommandEventArgs e)
(e.CommandName == RadGrid.InitInsertCommandName)
(e.CommandName == RadGrid.EditCommandName)
Please let me know if you have any questions.
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