SelectedIndexChanged方法不起作用

问题描述

protected void ClassDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
            if (ClassDropDownList.SelectedValue.Selected)
            {
            string myXMLfile = Server.MapPath("~/OrgList.xml");
            DataSet NAME_DATASET = new DataSet();
            NAME_DATASET.ReadXml(myXMLfile);
            NameDropDownList.DataSource = NAME_DATASET;
            NameDropDownList.DataTextField = "NAME";
            NameDropDownList.DataValueField = "ID";
            NameDropDownList.DataBind();
            }
}

我已经有一个类下拉列表.当在类下拉列表中选择一个项目时，我希望填充名称下拉列表.为什么不人口稠密.

I already have a class dropdownlist .when an item is selected in the class dropdown list i want the name dropdownlist to be populated. why is not popuating . what else should be done can i get the c# code please.

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