DropdownList

前台： 

<asp:DropDownList ID="Manager" AutoPostBack="true" runat="server" OnSelectedIndexChanged="DropDownList4_SelectedIndexChanged1"></asp:DropDownList>

后台：

 void BindDropDownList4()
    {
        //  DropDownList4.Items.Clear();
        Manager.AppendDataBoundItems = true;
        Manager.Items.Add(new ListItem("经理", "-1"));
        //DropDownList4.Items.Add(new ListItem("请选择一个职位", "-1"));
        Manager.DataTextField = "Name";
        Manager.DataValueField = "id";
        string str = "select id,Name  from Employee";
        Manager.DataSource = DBHelper.GetTable(str);
        Manager.DataBind();

    }

取值：string str=DropDownList4.SelectedValue;