taking product of two colums in gridview

private void DGViewIn_CurrentCellDirtyStateChanged(object sender, EventArgs e)
        {
            //Check if the Current Cell is Changed
            if (DGViewIn.IsCurrentCellDirty == true)
            {

DGView.CurrentRow.Cells[3].Value=int.Parse(DGView.CurrentRow.Cells[1].Value.ToString())*int.Parse(DGView.CurrentRow.Cells[2].Value.ToString());
DGView.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
}