What programmers do when they get an error message, is google it to read about what causes it. This error means that you've not written an event handler to handle the event of an attempt to delete a row.
mohammed sadeq wrote:
i need to delete row then without rebind gridview again
This is an utterly retarded request. Your error has nothing to do with rebinding, but it's still stupid. Rebinding is the best way to know for sure your delete worked and that what you're looking at is an accurate representation of what's in your database.