Ajax call in Asp.net

Different ways of Ajax call in Asp.net

PageMethods:

function CallMe(status) {

  // call server side method

  PageMethods."Method name"(parameters, CallOnSuccess, CallOnFailure);

}

// Calls the popup on successfull completion

function CallOnSuccess (res) { }

// alert message on some failure

function CallOnFailure (res, destCtrl) { }

Jquery:

function GetColumnList() {

            jQuery.ajax({

                url: Page/CallBack',

                type: "POST",

                data: "{}",

                contentType: "application/json; charset=utf-8",

                dataType: "json",

                success: function (data) {

                    try {

                        data.d;

                    }

                    catch (err) {

                        //   alert(err.Message);

                    }

                }

            });

        }      

CSharp:

[WebMethod]

public static void CallBack() { }