how can load ajax function in other web site?

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C#

ASP.NET

Ajax

I have a function to send request and get html web site and Response.Write the html. when the site use ajax code the browser can not load ajax because html and JavaScript code was response.write in my web site page how can call WebMethod function without ajax and JavaScript , in C# code behind?

Tuple<string, System.Net.CookieContainer> tuple = Web_Functions.GetHtmlSourceAndCookies(site ), cookies);
Response.Write(tuple .Item1);

public static Tuple<string, CookieContainer> GetHtmlSourceAndCookies(string Url, CookieContainer cookies)
{
    try
    {
        Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
        HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(Url);
        Request.AllowAutoRedirect = true;
        Request.CookieContainer = cookies;
        Request.UserAgent = "Foo";
        Request.Accept = "*/*";
        using (HttpWebResponse response = (HttpWebResponse)Request.GetResponse())
        {
            Stream ReceiveStream = response.GetResponseStream();
            StreamReader readStream = new StreamReader(ReceiveStream, encode);
            string strWebFramResponse = readStream.ReadToEnd();
            readStream.Close();
            response.Close();
            return Tuple.Create(strWebFramResponse, cookies); 
        }
    }
    catch (WebException ex)
    {
        return Tuple.Create("false", cookies); 
    }
}