Customer person = new Customer();
person.Name = "John Jones (JavaScriptSerializer)";
person.Entered = new DateTime(2007, 10, 10);

person.Addresses.Add(new Address());

Address addr = new Address();
addr.Street = "501 N. 15th Street";
addr.City = "Hood River";
addr.State = "OR";
addr.Zip = "97031";
person.Addresses.Add(new Address());

JavaScriptSerializer ser = new JavaScriptSerializer();
string json = ser.Serialize(person);
Response.Write("<pre>" + Server.HtmlEncode(json) + "</pre>");


ser = new JavaScriptSerializer();                
var person2 = ser.Deserialize<Customer>(json);

Response.Write(person2.Name);

    parse: function (text) {
    try {
         if (!(!(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
                 text.replace(/"(\\.|[^"\\])*"/g, '')))  ))
                 return false;
        
        // *** RAS Update:  Fix up Dates: ISO and MS AJAX format support
        var regEx = /(\"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}.*?\")|(\"\\\/Date\(.*?\)\\\/")/g;
        text = text.replace(regEx,this.regExDate);      
        
        return eval('(' + text + ')');    

    // *** RAS Update: RegEx handler for dates ISO and MS AJAX style
    regExDate: function(str,p1, p2,offset,s) 
    {
        str = str.substring(1).replace('"','');
        var date = str;
        
        if (str.substring(0,7) == "\\\/Date(") {  // MS Ajax date: /Date(19834141)/       
            str = str.match(/Date\((.*?)\)/)[1];                        
            date = "new Date(" +  parseInt(str) + ")";
        }
        else { // ISO Date 2007-12-31T23:59:59Z                                     
            var matches = str.split( /[-,:,T,Z]/);        
            matches[1] = (parseInt(matches[1],0)-1).toString();                     
            date = "new Date(Date.UTC(" + matches.join(",") + "))";         
       }                  
        return date;
    },

case 'object':
if (x) {
 // RAS: Added Date Parsing
 if (x.toUTCString)
     return e('\"\\/Date(' + x.getTime() + ')\\/\"' ); // MS Ajax style
     //return e('new Date(' + x.getTime() + ')' );

            [Serializable]
            public class Person
            {
                public string Name = "Jim";
                public DateTime Entered = DateTime.Now;
            }

            [Serializable]
            public class Customer : Person
            {
                public List<Address> Addresses = new List<Address>();
            }

            [Serializable]
            public class Address
            {
                public string Street = "32 Kaiea Place";
                public string City = "Paia";
                public string State = "HI";
                public string Zip = "96779";

            }

<System.Runtime.InteropServices.ProgId("XELEM_NET.YELEM")> _
<DataContract(Name:="YELEM")> Public Class YELEM

    <DataMember(Name:="key")> Public fldnam As String
    <DataMember(Name:="val")> Public fldval As String

    Private Sub Class_Initialize_Renamed()
    End Sub
    Public Sub New()
        MyBase.New()
        Class_Initialize_Renamed()
    End Sub

    Private Sub Class_Terminate_Renamed()
    End Sub
    Protected Overrides Sub Finalize()
        Class_Terminate_Renamed()
        MyBase.Finalize()
    End Sub

End Class

<root type="object">
  <key>Target</key> 
  <val>WmbCreate()</val> 
  </root>

' here calling serializer and deserializer (and serializer works)
        Dim yele As New WebSpSe.YELEM : yele.fldnam = "Target" : yele.fldval = "WmbCreate()"
        Dim jdcs As New DataContractJsonSerializer(GetType(WebSpSe.YELEM))
        WriteObjectWithInstance2(jdcs, yele, "JsonDatacontract.xml")
        '        Dim wscol2jd As WebSpSe.YWSCOL = CType(ReadObjectWithInstance(jdcs, "JsonDatacontract.xml"), WebSpSe.YWSCOL)
        Dim ele2 As WebSpSe.YELEM = CType(ReadObjectWithInstance2(jdcs, "JsonDatacontract.xml"), WebSpSe.YELEM)
        Console.WriteLine("Element is : " + ele2.fldnam.ToString + "   " + ele2.fldval.ToString)
'more caller code ......


'this fails
Private Function ReadObjectWithInstance2(ByVal xm As XmlObjectSerializer, _
                                            ByVal fileName As String) As WebSpSe.YELEM
        Console.WriteLine(xm.GetType())
        Dim fs As New FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read)
        fs.Position = 0
        Dim ele As WebSpSe.YELEM = xm.ReadObject(fs)     'exception as showm ..... why
        fs.Close()
        Console.WriteLine("Done reading {0}", fileName)
        Return ele

    End Function

string json = Encoding.Default.GetString(ms.ToArray());

string json = Encoding.UTF8.GetString(ms.ToArray());

public static string ToJSON( this object obj )
{
    if ( !IsSerializable(obj) )
    {
        throw new Exception("Target object must be serializable.");
    }
    string json = string.Empty;
    DataContractJsonSerializer ser = new DataContractJsonSerializer(obj.GetType());
    using ( MemoryStream ms = new MemoryStream() )
    {
        ser.WriteObject(ms, obj);
        json = Encoding.Default.GetString(ms.ToArray());
    }
    return json;
}

public static T FromJSON<T>( this string json )
        {
            using ( MemoryStream ms = new MemoryStream(ASCIIEncoding.Default.GetBytes(json)) )
            {
                DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
                return (T)ser.ReadObject(ms);
            }
        }

public static bool IsSerializable( this object obj )
{
    MemoryStream ms = null;
    BinaryFormatter bf = null;
    try
    {
        ms = new MemoryStream();
        bf = new BinaryFormatter();
        bf.Serialize(ms, obj);
        return true;
    }
    catch ( System.Runtime.Serialization.SerializationException )
    {
        return false;
    }
    catch ( Exception exc )
    {
        throw exc;
    }
    finally
    {
        ms.Close();
        ms.Dispose();
    }
}

public static void RegisterJSONObject( this Page page, object obj, string objectJSName )
{
    string key = Guid.NewGuid().ToString();
    StringBuilder sb = new StringBuilder();
    sb.Append("var jsonText = '" + obj.ToJSON() + "'\n");
    sb.Append("var " + objectJSName + " = eval('(' + jsonText + ')');\n");
    page.ClientScript.RegisterStartupScript(page.GetType(), key, sb.ToString(), true);
}

[DataContract]
    public class ChatRoomParticipant  // Wrapper class for single record
    {
        [DataMember]
        public Guid ChatRoomId { get; set; }
        [DataMember]
        public Guid PersonaId { get; set; }
    }

Reference for http://rest.versionme.com/ChatroomParticipantsService/{AUTHENTICATIONTOKEN}/{APPLICATIONTOKEN}/json/insert
 
 
Url: http://.../ChatroomParticipantsService/.../xml/insert 
 
HTTP Method: POST 
 
...
 
The following is an example request Xml body: 
 
<ChatRoomParticipant xmlns="http://schemas.datacontract.org/2004/07/ChatRoomParticipantsService">
  <ChatRoomId>1627aea5-8e0a-4371-9022-9b504344e724</ChatRoomId>
  <PersonaId>1627aea5-8e0a-4371-9022-9b504344e724</PersonaId>
</ChatRoomParticipant>

[WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Xml, RequestFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "{authenticationtoken}/{applicationtoken}/xml/insert")]
        

Call= 
POST /ChatRoomParticipantsService/3528209f-5e2b-4c14-9fd3-4a827ed8fa52/00000000-0000-0000-0000-000000000000/Xml/insert HTTP/1.1
 
Request body (TestView)= 
<ChatRoomParticipant xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/ChatRoomParticipantsService"><ChatRoomId>1627aea5-8e0a-4371-9022-9b504344e724</ChatRoomId><PersonaId>1627aea5-8e0a-4371-9022-9b504344e724</PersonaId></ChatRoomParticipant>
 
Response bosy (TextView)=
ReadResponse() failed: The server did not return a response for this request.  

[DataContract]
    public class Person
    {
        [DataMember]
        public int Age { get; set; }
 
        [DataMember]
        public string Name { get; set; }
 
        public Person(string name, int age)
        {
            this.Name = name;
            this.Age = age;
        }
 
        public Person()
        {
 
        }
        
        public override string  ToString()
        {
            return String.Format("Name: {0}, Age: {1}", this.Name, this.Age);
        }
    }
 
private static void DeserializeFromJson()
        {
            StringBuilder json = new StringBuilder();
            json.Append("{");
            json.Append("\"name\"");
            json.Append(":");
            json.Append("\"Hector\"");
            json.Append(",");
            json.Append("\"age\"");
            json.Append(":");
            json.Append("\"33\"");
            json.Append("}");
 
            Person person = new Person();
            MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json.ToString()));
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(person.GetType());
            person = serializer.ReadObject(ms) as Person;
            ms.Close();
 
            Console.WriteLine(person.ToString());
            Console.ReadLine();            
        }

[KnownType(typeof(Customer))]
[Serializable]
public class CustomerBase
.
.
.
 
[Serializable]
public class Customer : CustomerBase

        List<CustomerBase> c = new List<CustomerBase>();
        c.Add(person);
        ser = new DataContractJsonSerializer(c.GetType());
        ms = new MemoryStream();
        ser.WriteObject(ms, c);
 
        json = Encoding.Default.GetString(ms.ToArray());
        ms.Close();
        Response.Write("<pre>" + Server.HtmlEncode(json) + "</pre>");

[{"__type":"test.Customer:#","Addresses":[
{"City":"Paia","State":"HI","Street":"32 Kaiea Place","Zip":"96779"},
{"City":"Paia","State":"HI","Street":"32 Kaiea Place","Zip":"96779"}],
"Entered":"\/Date(1191988800000-0400)\/","Name":"John Jones"}]