问动态数据Web应用程序:如何更改默认筛选器，使其显示超过10行？

EN

protected void Page_Load(object sender, EventArgs e)
{
    Control c = Parent;
    while (c != null)
    {
        if (c is GridView)
        {
            _gridView = (GridView)c;
            break;
        }
        c = c.Parent;
    }
    ***_gridView.PageSize = 20;***
}

<asp:DropDownList ID="DropDownListPageSize" runat="server" 
    AutoPostBack="true" 
    CssClass="droplist" 
    onselectedindexchanged="DropDownListPageSize_SelectedIndexChanged">
    <asp:ListItem Value="5" />
    <asp:ListItem Value="10" />
    <asp:ListItem Value="15" />
    <asp:ListItem Value="20" />
</asp:DropDownList>

<asp:Gridview PageSize="20" runat="server" ID="GridView">

if (!IsPostBack)
        {
            _gridView.PageSize = 100;
        }