动态控件加事件问题

Question

事件中怎么捕捉当前控件啊
控件代码
           DropDownList ddl = new DropDownList();
            ddl.ID = "ddllast"  ;
            ddl.DataSource = db.GetDataSet("select * from leixing where prents=" + list1[0].ToString());
            ddl.DataTextField = "leixing";
            ddl.DataValueField = "id";
            ddl.DataBind();
            ddl.Items.Insert(0, new ListItem("-请选择-", "0"));
            ddl.SelectedIndexChanged +=new EventHandler(DropDownList1_SelectedIndexChanged);
            Panel1.Controls.Add(ddl);
事件代码
   protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList list = (DropDownList)sender;
        Session["leixing"] = list.SelectedValue;
        leixing(int.Parse(list.SelectedValue));
    }
事件代码里如何捕捉当前使用的控件啊谢谢

Answer 1

是webform么？
dll.autopostback = true;
好像要设置这个

Answer 2

DropDownList ddl = new DropDownList();
dll.AutoPostBack = true;
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
  {
   DropDownList ddl= sender as DropDownList;
   string s=ddl.SelectedValue;
 }

Answer 3

DropDownList ddl= sender as DropDownList;

Answer 4

也可:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
  {
  if(sender is DropDownList)
  {
    string s=((DropDownList)sender).SelectedValue;
  }
 }