打开aspx，自动调用acsx的后台方法（即aspx页面加载，ascx后台方法自动执行）

aspx页面使用的ascx代码：

ascx文件中，想要在页面加载时自动调用以下方法：
public InfoType InfoType
{
get { return infoType; }
set { infoType = value; }
}
protected void lbtn_all_Click(object sender, EventArgs e)
{
int view_count = mv_view.Views.Count;

    switch (infoType)
    {
        case InfoType.news:
            lbtn_allInfo.Text = "新闻公告";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_news");
            BindNewsAll();
            break;
        case InfoType.informs:
            lbtn_allInfo.Text = "安装告知公示";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_inform");
            BindInformAll();
            break;
        case InfoType.trains:
            lbtn_allInfo.Text = "培训考核班公布";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_train");
            BindTrainsAll();
            break;
        case InfoType.examResult:
            lbtn_allInfo.Text = "考核成绩公布";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_examResult");
            BindExamAll();
            break;
        case InfoType.licence:
            lbtn_allInfo.Text = "考核证号公布";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_licence");
            BindLicenceAll();
            break;
        case InfoType.yearClass:
            lbtn_allInfo.Text = "年审班公布";
            mv_view.ActiveViewIndex = view_count - 1;
            setVisible("info_year");
            BindYearAll();
            break;
    }
    Pager1.ItemCount = dt.Rows.Count;
}

 aspx页面上ascx的ID.lbtn_all_Click(null,null);