How can we pass the class object as XML to WCF REST post MET

Question

I have a scenario where I need to send the class object to the WCF REST method as input as given below .

[OperationContract]
        [WebInvoke(Method = "POST", UriTemplate = "/InsertContact", ResponseFormat = WebMessageFormat.Xml,
          RequestFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Wrapped)]
        int InsertContact(ContactType objContactType);

 

Getting the below error in the Fiddler

 

<Fault xmlns="http://schemas.microsoft.com/ws/2005/05/envelope/none"><Code><Value>Receiver</Value><Subcode><Value xmlns:a="http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher">a:InternalServiceFault</Value></Subcode></Code><Reason><Text xml:lang="en-US">Error in deserializing body of request message for operation 'InsertContact'. OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'InsertContact' and namespace 'http://tempuri.org/'. Found node type 'Element' with name 'ContactType' and namespace ''</Text></Reason><Detail><ExceptionDetail xmlns="http://schemas.datacontract.org/2004/07/System.ServiceModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><HelpLink i:nil="true"/><InnerException><HelpLink i:nil="true"/><InnerException i:nil="true"/><Message>OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'InsertContact' and namespace 'http://tempuri.org/'. Found node type 'Element' with name 'ContactType' and namespace ''</Message><StackTrace>   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest)
    at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest)
    at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)</StackTrace><Type>System.Runtime.Serialization.SerializationException</Type></InnerException><Message>Error in deserializing body of request message for operation 'InsertContact'. OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'InsertContact' and namespace 'http://tempuri.org/'. Found node type 'Element' with name 'ContactType' and namespace ''</Message><StackTrace>   at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)
    at System.ServiceModel.Dispatcher.DemultiplexingDispatchMessageFormatter.DeserializeRequest(Message message, Object[] parameters)
    at System.ServiceModel.Dispatcher.UriTemplateDispatchFormatter.DeserializeRequest(Message message, Object[] parameters)
    at System.ServiceModel.Dispatcher.CompositeDispatchFormatter.DeserializeRequest(Message message, Object[] parameters)
    at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc)
    at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace><Type>System.ServiceModel.CommunicationException</Type></ExceptionDetail></Detail></Fault>

I want to make my REST API to accept either JSON or XML request depending on the client.Do I need to set this property in the WebInvoke attribute or in the web.config ?
Passing the below XML
<ContactType> <ContactTypeID>3</ContactTypeID> <Name>Assistant Sales Representative</Name> <ModifiedDate>2002-06-01T00:00:00</ModifiedDate> </ContactType>
Can anyone help me regarding this ?