Currently, my `ApiController`s are returning XML as a response, but for a single method, I want to return JSON. i.e. I can't make a global change to force responses as JSON.

```
public class CarController : ApiController
{  
    [System.Web.Mvc.Route("api/Player/videos")]
    public HttpResponseMessage GetVideoMappings()
    {
        var model = new MyCarModel();    
        return model;
    }
}

```

I tried doing this, but can't seem to convert my model to a JSON string correctly:

```
var jsonString = Json(model).ToString();    
var response = this.Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(jsonString, Encoding.UTF8, "application/json");
return response;

```