รบกวนสอบถามเรื่องการกด enter ใน cell ใน datagridview vb.net

            this.dataGridView1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(dataGridView1_KeyPress);


void dataGridView1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            throw new System.NotImplementedException();
            if (e.KeyChar == 13)
            {
                for (int ix = 0; ix < dataGridView1.Rows.Count; ix++)
                {
                    dataGridView1.Rows[ix].Cells[4].Value = Convert.ToString(Convert.ToInt32(dataGridView1.Rows[ix].Cells[1].Value) + Convert.ToInt32(dataGridView1.Rows[ix].Cells[2].Value) + Convert.ToInt32(dataGridView1.Rows[ix].Cells[3].Value));
                }
            }
        }

private void button1_Click_1(object sender, EventArgs e)
        {
            DataGridViewRow dgvRow = new DataGridViewRow();
            DataGridViewCell dgvCell;
            dgvCell = new DataGridViewTextBoxCell();
            dgvCell.Value = "คอมลัม1";
            dgvRow.Cells.Add(dgvCell);

            dgvCell = new DataGridViewTextBoxCell();
            dgvCell.Value = "คอมลัม2";
            dgvRow.Cells.Add(dgvCell);

            dgvCell = new DataGridViewTextBoxCell();
            dgvCell.Value = "คอมลัม3";
            dgvRow.Cells.Add(dgvCell);

            dataGridView1.Rows.Add(dgvRow);
        }

Private Sub DataGridView1_CellEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEnter

        If e.ColumnIndex.ToString = 3 Then
            v = CInt(DataGridView1.Rows(e.RowIndex).Cells("A").Value) + CInt(DataGridView1.Rows(e.RowIndex).Cells("B").Value) + CInt(DataGridView1.Rows(e.RowIndex).Cells("C").Value)
            DataGridView1.Rows(e.RowIndex).Cells("D").Value = v

            End If

    End Sub