If one exception is thrown in UpdateCommand event of RadGrid and not catched, seems the page will no any error information and edit mode is still in there . Whether must add try catch block to handle all exception?
I tried to reproduce the described issue but to no avail. If the exception is thrown into the UpdateCommand event of the RadGrid the yellow window with exception details is shown into the browser. I am sending you a simple example which demonstrates that. Please check it out and let me know what differs in your case. Looking forward for your reply.
All the best,
the Telerik team
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