C# Code Snippet needs a clear handlers to work.

Our API requires that customers send vnd mime types in both the Accept and Content-Type headers.

With the C# example, the following code is provided:

```
var client = new RestClient("https://api.whispir.com/messages?apikey=REPLACE_ME");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/vnd.whispir.message-v1+json");
request.AddHeader("accept", "application/vnd.whispir.message-v1+json");
request.AddHeader("authorization", "");
request.AddParameter("application/vnd.whispir.message-v1+json", "{\"to\":\"\",\"subject\":\"\",\"body\":\"\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

The problem though is that the `request.AddHeader` method is not respected unless the following code is provided on line 2:

`client.ClearHandlers();`

This code clears the default handlers allowing the user to set custom headers.

Can you please include this in your out of the box rendering of C# code.

Start from the C# example renderer or template that produces the shown RestClient snippet; the issue does not name a file or test. Update the rendered example to include client.ClearHandlers() on line 2, then verify that the generated C# snippet contains it before the custom headers are added.

Written by the indexing model from the issue text.