Deserialize ModelStateDictionary

gistfile1.txt

Original Stack Overflow Answer from http://stackoverflow.com/a/23506548/586518

Original Code from SO answer:

```csharp
var value = await response.Content.ReadAsStringAsync();
if (!response.IsSuccessStatusCode)
{
    var obj = new { message = "", ModelState = new Dictionary<string,string[]>() };
    var x = JsonConvert.DeserializeAnonymousType(value, obj);
    throw new AggregateException(x.ModelState.Select(kvp => new Exception(string.Format("{0}: {1}", kvp.Key, string.Join(". ", kvp.Value)))));
}
```