download file from an asp button using ajax post methods

$('#ActivateBtn').click
    (
        function () {

            var SocietyNameTBxvar = document.getElementById("<%=SocietyNameTBx.ClientID%>");
            var UserNbreTBxvar = document.getElementById("<%=UserNbreTBx.ClientID%>");
            
            var params = "{ company : \"" + SocietyNameTBxvar.value + "\", users : \"" + UserNbreTBxvar.value +"\"}";
                
            $.ajax (
            {
                type: "POST",
                url: "CreateTextFile.aspx",
                data: params,
                contentType: "application/x-www-form-urlencoded",
                async: true,
                cache: false,
                success: function (result) {
                // don't know how to get the text file !
                },
                error: function (result) {
                alert("Due to unexpected errors we were unable to load data");
            }
                }

            );
            return false;
        }
    ); 

protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                HttpResponse Response = HttpContext.Current.Response;

                string requestType = Request.Params["requestType"];


                //populate variables from posted data
                string company = Request.Params["company"];
                string users = Request.Params["users"];
                string attachment = "attachment; filename=" + filename;

                Response.Clear();
                Response.ClearHeaders();
                Response.ClearContent();
                Response.AddHeader("Content-Disposition", attachment);
                Response.ContentType = "application/octet-stream";
                using (StreamWriter LicFile = new StreamWriter(Response.OutputStream, Encoding.UTF8))
                {
                    LicFile.WriteLine(Resx.SocietyName + " : " + company);
                    LicFile.WriteLine(Resx.UserNbre + " : " + users);
                    
                }
                Response.End();
            }
            catch (Exception exp)
            {
            }
        }