I had this working before and now I do not. But, I cannot see what I have done to make it not work?

This is my MVC API Controller:

```
[HttpPost]
public Models.CustomerAddress Add(string Customer)
{
    //the customer is a json string
}

```

This is my C# desktop Client:

```
using (var client = new HttpClient())
{
    client.BaseAddress = new Uri(Shared.URL);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(Shared.HeaderType));
    string jsonInput = JsonConvert.SerializeObject(customer);
    HttpContent contentPost = new StringContent(jsonInput, Encoding.UTF8, "application/json");
   var response = client.PostAsync(string.Format("http://myuri/api/Customer/Add?Customer="), contentPost).Result;
    response.EnsureSuccessStatusCode();
    string json = await response.Content.ReadAsStringAsync();
    return JsonConvert.DeserializeObject<Model.CustomerAddress>(json);
}

```

The customer object is definitely populated...

This does call my api but the Customer string is null??