How can I call a .NET class method from jquery

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jQuery

I need some help here. I know how to call a Page method/Webservice Method using jquery ajax but i would like to know how to call .NET class method to avoid copying codes from handler/page method or service method.

I have a class declared with static methods all decorated with webmethod attributes. I have tried it but i get an error 500. I know it's possible to call an action method in MVC but i'm working on a webforms project and would like to how to do it in webforms.

Any help would be highly appreciated.

Thanks

What I have tried:

.Net Class

<pre>
using System.Web.Services;
using System.Web.Script.Services;

public class Container
{
    public int Name { get; set; }
    public int Size {get;set;}

    [WebMethod()]
    [ScriptMethod()]
    public static bool Exists(string ContainerName)
    {
        // Check stuff here and return true or false;
        return true;
    }
}

Jquery Code

$(document).ready(function () {
                            $('#testModel').click(function (e) {
                                // alert("calling web service now");

                                $.ajax({
                                    url: 'Models/Container/Exists',
                                    method: 'post',
                                    contentType: 'application/json; charset=utf-8;',
                                    data: '{ "ContainerName": "xxxx" }',
                                    success: function (r) {
                                        alert(r.d);
                                    },
                                    error: function (err) {
                                        alert(err.status + "\nScriptCall Failed");
                                    }
                                });
                            });
                        });