Александр Sinelnikov

var senderGrid = (DataGridView)sender;
            if (e.RowIndex == dataGridView1.NewRowIndex || e.RowIndex < 0)
                return;

            if (e.ColumnIndex == dataGridView1.Columns["DeleteButtonColumn"].Index)
            {
                dataGridView1.Rows.RemoveAt(e.RowIndex);
            }