C# unable to upload a transient document

I am trying to upload a transient document in C# and I have not been able to do so.

MultipartFormDataContent mycontent = new MultipartFormDataContent();

        string encodedFileName = HttpUtility.HtmlEncode("1-Registration Form.pdf");

        HttpContent fileContent = new ByteArrayContent(System.IO.File.ReadAllBytes(ConfigurationManager.AppSettings["PATH_TO_PRIVATE_STORAGE"] + @"documents\1-Registration Form.pdf"));

        mycontent.Add(new StringContent("application/pdf"), "Mime-Type");

        mycontent.Add(new StringContent(encodedFileName), "File-Name");

        fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")

        {

            Name = "File",

            FileName = encodedFileName

        };

            mycontent.Add(fileContent);

        var objGetData = new Models();

        var objClient = new RestClient("https://api.na1.echosign.com:443/api/rest/v5");

        var objRequest = new RestRequest("transientDocuments", Method.POST);

        objRequest.AddFile("file", System.IO.File.ReadAllBytes(ConfigurationManager.AppSettings["PATH_TO_PRIVATE_STORAGE"] + @"documents\1-Registration Form.pdf"), "1-Registration Form.pdf");

        objRequest.AddHeader("Access-Token", "MyAPIKeyHere");

        objRequest.RequestFormat = DataFormat.Json;

        objRequest.AddBody(objGetData);

        IRestResponse objResponse = objClient.Execute(objRequest);

        var content = objResponse.Content;

        JObject jsonLinq = JObject.Parse(content);

I get An error saying Bad request.  Any help would be appreciated, I've been at this for a week now.