ASP.NET

httpcontext.current.session.add("test", "persist")

txt_text.text = httpcontext.current.session("test")

<asp:TextBox ID="txtBirthDate" runat="server" />

$(function(){
    $("[id$='txtBirthDate']").prop("readonly", true);
});

$(document).on("submit", "form", function(){
    $("[id$='txtBirthDate']").prop("disabled", false);
});

1. Well as far as I know, Javascript and jQuery doesn't allow you to do cross domain calls, to protect the website from false calls to web services within your web site. But on the flip side of the coin, I know you cal call card processing services from jquery, so I need to update my knowledge on that.
2. You need to check your script for errors on something like http://www.javascriptlint.com/online_lint.php[^]
3. With Javascript and JQuery, you really need to use the single quote char, and not the double quote char. by using the single quote char to wrap text values, you can use the double quote char without having to escape it
   e.g.

   var html = '<div style="classname"></div>';

$(document).ready(function () {
 2          $.support.cors = true;
 3          $.ajax({
 4              type: "GET",
 5              crossDomain: true,
 6              contentType: "application/json; charset=utf-8",
 7           //  url: "/api/stw",
 8               url: "<a href="http://apitesting.domain.com/api/stw">http://apitesting.domain.com/api/stw</a>,",
    ============================^
    SyntaxError: missing } after property list
 9              data: "{}",
10              dataType: "json",
11              success: function (data) {
12                  console.log(data);
13                 // var myData = JSON.parse(data)
14                  for (var i = 0; i < data.length; i++) {
15                      $("#tbDetails").append("<tr><td>" + data[i].Name + "</td><td>" + data[i].loan + "</td><td>" + data[i].evnt + "</td></tr>");
16                  }
17              },
18              error: function (result) {
19                  alert("Error");
20              }
21          });
22      });

void button_Click(object sender, EventArgs e) {
   var button = sender as Button; // cast the object to Button
   var name = button.Name; // get the name of the button which triggered the function
}