在c#中以编程方式在网格视图的底部添加一行？

protected void Page_Load(object sender, EventArgs e)
{
    GridView1.RowDataBound += GridView1_RowDataBound;
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Footer)
    {
        GridViewRow newRow = new GridViewRow(0, 0, DataControlRowType.DataRow, DataControlRowState.Normal);
        TableCell newCell = new TableCell();
        newCell.ColumnSpan = GridView1.Columns.Count;
        newCell.Text = "这是新行的内容";
        newRow.Cells.Add(newCell);
        GridView1.Controls[0].Controls.AddAt(e.Row.RowIndex + 1, newRow);
    }
}