There is no row at position 1.

Can anybody give me any idea?

There is no row at position 1.

dgUsers.EditItemIndex = (int)e.Item.ItemIndex;

Line 238:dsUser1.Tables["LOCAL_USERS"].Rows[dgUsers.EditItemIndex].Delete();This usually means that your table is empty. Can you make sure that your function doesn't sometimes return an empty table?

e.g., if you try and get a table full of names starting with 'Z', and you get no results,
trying to access row 1 will fail, as it's completely empty.