asp.net 省市区级联

1.aspx

        <script src="js/PCASClass.js" type="text/javascript"></script>
        <select id="s_province" name="province1"></select>
        <select id="s_city" name="city1"></select>  
        <select id="s_county" name="area1"></select>
         <script language="javascript" defer>
             new PCAS("province1", "city1", "area1", "<%=DiZhi1.author %>", "<%=DiZhi1.source %>", "<%=DiZhi1.field4 %>");
         </script>
1.aspx.cs

protected void Page_Load(object sender, EventArgs e)
    {
        if (HttpContext.Current.Session["openid"] != null)
        {
        }
        else
        {
            Response.Redirect("index.aspx", true);
        }
    }

 protected void Button1_Click(object sender, EventArgs e)
    {
       if (Request.Form["city1"] == "")
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "d", "alert('City cannot be empty！！');", true);
        }
        else if (Request.Form["area1"] == "")
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "d", "alert('District cannot be empty！！');", true);
        }
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