Upload File Without Multipart/Form-Data Using RestSharp - restsharp

Question

Below, there is a POST Request Done With Standard HttpWebRequest , and HttpWebResponse. Basically it post binanry file with some parameters.
How Can I do The Same Thing With RestSharp ?
Source:
https://github.com/attdevsupport/ATT_APIPlatform_SampleApps/tree/master/RESTFul/SpeechCustom, ATT_APIPlatform_SampleApps/RESTFul/Speech/Csharp/app1/ ]
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(string.Empty+parEndPoint );
httpRequest.Headers.Add("Authorization", "Bearer " + parAccessToken);
httpRequest.Headers.Add("X-SpeechContext", parXspeechContext);
if (!string.IsNullOrEmpty(parXArgs))
{
httpRequest.Headers.Add("X-Arg", parXArgs);
}
string contentType = this.MapContentTypeFromExtension(Path.GetExtension(parSpeechFilePath));
httpRequest.ContentLength = binaryData.Length;
httpRequest.ContentType = contentType;
httpRequest.Accept = "application/json";
httpRequest.Method = "POST";
httpRequest.KeepAlive = true;
httpRequest.SendChunked = parChunked;
postStream = httpRequest.GetRequestStream();
postStream.Write(binaryData, 0, binaryData.Length);
postStream.Close();
HttpWebResponse speechResponse = (HttpWebResponse)httpRequest.GetResponse();

Answer 1

A simple upload example:
RestClient restClient = new RestClient("http://stackoverflow.com/");
RestRequest restRequest = new RestRequest("/images");
restRequest.RequestFormat = DataFormat.Json;
restRequest.Method = Method.POST;
restRequest.AddHeader("Authorization", "Authorization");
restRequest.AddHeader("Content-Type", "multipart/form-data");
restRequest.AddFile("content", imageFullPath);
var response = restClient.Execute(restRequest);