[WebMethod]

public void HelloWorld(string person)

{

    JavaScriptSerializer serializer = new JavaScriptSerializer();

    Person x = serializer.Deserialize<Person>(person);

}

function stringifyDemo() {

    var Person = new Object();

    Person.Name = 'Shlomo';

    Person.Age = 25;

    var xhr = new XMLHttpRequest();

    var url = "WebService1.asmx/HelloWorld?person=" + JSON.stringify(Person);

    xhr.open("GET", url, true);

    xhr.send('');

}

function stringifyDemoReplaceToUpper() {

    var data = new Array();

    data[0] = "a";

    data[1] = "ab";

    data[2] = "edwqe";

    data[3] = "dfvgd vf";

    var xhr = new XMLHttpRequest();

    var url = "WebService1.asmx/GetArray?data=" + JSON.stringify(data,

        function replaceToUpper(key, value) {

            for (var i = 0; i < value.length; i++) {

                value[i] = value[i].toString().toUpperCase();

            }

            return value;

        });

    xhr.open("GET", url, true);

    xhr.send('');

}

function toJSONDemo() {

    var Person = new Object();

    Person.FirstName = 'Shlomo';

    Person.Age = 25;

    Person.LastName = 'Goldberg';

    Person.Name = Person.FirstName + " " + Person.LastName;

    Person.toJSON = function(key) {

        var PersonJ = new Object();

        PersonJ.FirstName = this["FirstName"];

        PersonJ.Age = this["Age"]; ;

        PersonJ.LastName = this["LastName"];

        return PersonJ;

    }

    var xhr = new XMLHttpRequest();

    xhr.open("GET", "WebService1.asmx/Person2?data=" + JSON.stringify(Person), true);

    xhr.send('');

}

[WebMethod]

public string GetPerson()

{

    JavaScriptSerializer serializer = new JavaScriptSerializer();

    return serializer.Serialize(new Person() { Age = 25, Name = "Shlomo" });

}

function JSONParseDemo() {

    var xhr = new XMLHttpRequest();

    xhr.open("GET", "WebService1.asmx/GetPerson", true);

    xhr.onreadystatechange = function() {

        if (xhr.readyState == 4 && xhr.status == 200) {

            var person = JSON.parse(xhr.responseXML.text);

        }

    }

    xhr.send('');

}