此页的状态信息无效,可能已损坏 的处理办法及原因分析

                            string result = "";
                            string url = "http://localhost:1759/textWeb/b.aspx";
                            result =exec_url(url);
                            Label1.Text = result;

    public string exec_url(string url)
    {

        string result = "1";
        WebRequest request = WebRequest.Create(url);
        try
        {
            request.Timeout = 20000;//20秒超时
            WebResponse response = request.GetResponse();

            Stream resStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(resStream);
            result = sr.ReadToEnd();
            sr.Close();
            resStream.Close();
        }
        catch
        {
            return "1";
        }
        return result;

    }

html xmlns="http://www.w3.org/1999/xhtml">
head runat="server">
    title>无标题页/title>
/head>
body>
    form id="form1" runat="server">
    div>

   
    /div>
    /form>
/body>
/html>

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("你好 哈哈！");
    }
}