Question

Why are grid view cells automatically adding 0 at the foot of subtotal grid view?

        int qty = 0;
        int amount = 0;
        int rowtotal = 0;
        int subtotal = 0;
        int total = 0;

        foreach (DataGridViewRow row in itemgridview.Rows)
        {
            qty = Convert.ToInt32(row.Cells[1].Value); 
            amount = Convert.ToInt32(row.Cells[2].Value); 
            rowtotal = qty * amount;
            row.Cells[3].Value = rowtotal;
            subtotal += rowtotal;

        }

        total = subtotal;
        txtordertotal.Text = total.ToString();

Answer 1

Make AllowUsersToAddRow = false and then try again.this property will remove the extra row.