private static HttpRequestMessage CreateMultipartPostRequest( string uri, byte[] file, string fileName, string securityToken, params RequestParameter[] parameters) { Throw.IfArgumentNull(file, "file"); Throw.IfArgumentNullOrWhitespace(fileName, "fileName"); HttpRequestMessage request = HttpServiceClient.GetRequestTemplate(HttpMethod.Post, uri, securityToken); string boundary = HttpServiceClient.CreateBoundary(); MultipartFormDataContent multipartContent = new MultipartFormDataContent(boundary); StreamContent streamConent = HttpServiceClient.CreateFileContent(file, fileName); multipartContent.Add(streamConent); if (parameters != null) { foreach (RequestParameter parameter in parameters) { if (!string.IsNullOrWhiteSpace(parameter.Value)) { multipartContent.Add(new StringContent(parameter.Value), parameter.ParameterName); } } } request.Content = multipartContent; return(request); }