Dropdownlist三级联动出问题,求助高手

Question

  autompostback=“false” 就不会触发selectindexchanged 事件了

Answer 1

    if (!Page.IsPostBack)
    {
       ....
    ｝我觉得是这个问题。

Answer 2

  if   (!Page.IsPostBack)
        {
              ....
        ｝ 

Answer 3

贴出相关代码
updatepanel无刷新
http://topic.csdn.net/u/20090709/12/9eefeb53-c4a6-4fd0-8c1b-1d3282627417.html

Answer 4

谢谢各位
1 我这个页面没用Updatepanel,其中modalPE是一个ModalPopupExtender,加载好数据后,把一个panle弹出来,这三个下拉列表都在panle里
2 我就是想在选项变化后,回发后执行SelectedIndexChanged事件,加载下一级的下拉列表,两个有SelectedIndexChanged事件的下拉列表的 AutomPostBack都为true
下面是相关代码:
protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)//Category　下拉列表变化---1级下拉列表
    {
        bindSubCategoryDropDowsList();
        bindRCDropDowsList();
        modalPE.Show(); 
    }    public void bindSubCategoryDropDowsList() 
    {
        SubCategory_DropList.DataTextField = "SubCategory";
        sqlcon = new SqlConnection(strCon); //select SubCategory from [STARCAT].[dbo].[SubCategory] where Category = (select ID FROM [STARCAT].[dbo].[Category] where Category='Infrastructure')
        sqlcon.Open();
        string str = "select SubCategory from [STARCAT].[dbo].[SubCategory] where Category = (select ID FROM [STARCAT].[dbo].[Category] where Category='" + Category_DropList.Text + "')";
        SqlDataAdapter da = new SqlDataAdapter(str, sqlcon);
        DataSet ds = new DataSet();
        da.Fill(ds);
        SubCategory_DropList.DataSource = ds;
        SubCategory_DropList.DataBind();
        sqlcon.Close();
    }    protected void SubCategory_DropList_SelectedIndexChanged(object sender, EventArgs e)//Sub Category ---2级下拉列表
    {
        bindRCDropDowsList();
        modalPE.Show();
    }    public void bindRCDropDowsList() 
    {
        //select RootCause from STARCAT.dbo.ClassifiedRootCause where SubCategory = (select ID from STARCAT.dbo.SubCategory where SubCategory='Infra only')
        RootCause_DropList.DataTextField = "RootCause";
        sqlcon = new SqlConnection(strCon);
        sqlcon.Open();
        string str = "select RootCause from STARCAT.dbo.ClassifiedRootCause where SubCategory = (select ID from STARCAT.dbo.SubCategory where SubCategory='" + SubCategory_DropList.Text + "')";
        SqlDataAdapter da = new SqlDataAdapter(str, sqlcon);
        DataSet ds = new DataSet();
        da.Fill(ds);
        RootCause_DropList.DataSource = ds;
        RootCause_DropList.DataBind();
        sqlcon.Close();
    }