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dropdownlist 不刷新页面 textchanged

分数不够只能在这贴了!

 <asp:ScriptManager ID="ScriptManager1" runat="server">
                </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>

                <asp:DropDownList ID="ddl_lb" runat="server" CssClass="textbox" 
                    ontextchanged="ddl_lb_TextChanged" Width="60px" AutoPostBack="True">
                </asp:DropDownList>
            </ContentTemplate>
        </asp:UpdatePanel>


protected void ddl_lb_TextChanged(object sender, EventArgs e)
        {
            if (ddl_lb.SelectedValue == "病假" || ddl_lb.SelectedValue == "婚假" || ddl_lb.SelectedValue == "产/陪产假")
            {
                Response.Write("<script>alert('请病/婚/产/陪产假者需提供相关假期证明。');;</script>");
            }
            if (ddl_lb.SelectedValue == "丧假" && gh.Value.Substring(0, 1) == "1")
            {
               Response.Write("<script>alert('请丧假者需提供相关证明。');;</script>");
            }
        }     

textchanged不起作用!帮解决
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