how to get sum dynamically of datagridview column in textbox

Question

I want to get the sum of a column of datagridview and show that in textbox. After each entry the sum should be changed dynamically. For that I am using textChanged event of

Answer 1

private void dataGridView2_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex == 5)
        {
            summition();
        }
    }
    void summition() 
    { 
        double sum = 0;
        foreach (DataGridViewRow row in dataGridView2.Rows)
        {
            if(!row .IsNewRow )
                sum += Convert.ToDouble(row.Cells [5].Value .ToString () );
        }


        textBox9.Text = sum.ToString();
    }