How to send JSON to C# webservice

Question

I have a webservice which I created in C#. It looks as follows :

namespace MyNamespace
{
   public class MyService : IMyService
   {
      public InitializeResponse InitialiseConnection(InitializeRequest request)
      {
        InitializeConnectionLogic initializeConnectionLogic = new InitializeConnectionLogic();
        return initializeConnectionLogic.CreateConnection(request.Map()).Map();
      }
    }
}

I have a console-application which can call the service and create the object and then send it to the service.

PaymentBehaviorServiceClient serviceClient = new PaymentBehaviorServiceClient();
InitializeRequest initializeRequest = new InitializeRequest
    {
        SomeNumber = "869703978",
        SomeText = "FR28164"
    };
    InitializeResponse response = serviceClient.InitialiseConnection(initializeRequest);
    return response;

Now I would like to do the same but send the object as JSON. Is that possible and if so, how would I go about doing that?