adding row in a datagridview at runtime

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (keyData == Keys.Enter)
        {
            int iCol = dtg.CurrentCell.ColumnIndex;
            int iRow = dtg.CurrentCell.RowIndex;

            if (iCol == dtg.Columns.Count - 1)
            {
                if (iRow == dtg.Rows.Count - 1)
                {

                  // Based On Columns Numbers That You Are Declared In DataGridView
                    dtg.Rows.Add("FirstValue","SecondValue"," . . .");

                }
                dtg.CurrentCell = dtg[0, iRow + 1];
            }
            else
            {
                dtg.CurrentCell = dtg[iCol + 1, iRow];
            }
            return true;
        }
        return base.ProcessCmdKey(ref msg, keyData);
    }