Index was out of range. Must be non-negative and less than the size of the collection. Parameter na

[Elmira1987]

با سلام ...
من يه گريد ويو دارم كه توي رويداد userDeletingRow اون كد نوشمكه وقتي يه سطر رو انتخاب مي كنم اون رو حذف كنه . ولي الان error ميده ................

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index