ASP.NET - Consumir un WEBApi C# + Jquery

public class FileController : ApiController

{

    [HttpPost] // This is from System.Web.Http, and not from System.Web.Mvc

    public async Task<HttpResponseMessage> Upload()

    {

        if (!Request.Content.IsMimeMultipartContent())

        {

            this.Request.CreateResponse(HttpStatusCode.UnsupportedMediaType);

        }

        var provider = GetMultipartProvider();

        var result = await Request.Content.ReadAsMultipartAsync(provider);

        // On upload, files are given a generic name like "BodyPart_26d6abe1-3ae1-416a-9429-b35f15e6e5d5"

        // so this is how you can get the original file name

        var originalFileName = GetDeserializedFileName(result.FileData.First());

        // uploadedFileInfo object will give you some additional stuff like file length,

        // creation time, directory name, a few filesystem methods etc..

        var uploadedFileInfo = new FileInfo(result.FileData.First().LocalFileName);

        // Remove this line as well as GetFormData method if you're not

        // sending any form data with your upload request

        var fileUploadObj = GetFormData<InfoArchivo>(result);

        // Through the request response you can return an object to the Angular controller

        // You will be able to access this in the .success callback through its data attribute

        // If you want to send something to the .error callback, use the HttpStatusCode.BadRequest instead

        var returnData = "ReturnTest";

        return this.Request.CreateResponse(HttpStatusCode.OK, new { returnData });

    }

    // You could extract these two private methods to a separate utility class since

    // they do not really belong to a controller class but that is up to you

    private MultipartFormDataStreamProvider GetMultipartProvider()

    {

        // IMPORTANT: replace "(tilde)" with the real tilde character

        // (our editor doesn't allow it, so I just wrote "(tilde)" instead)

        var uploadFolder = "'/App_Data/Tmp/FileUploads"; // you could put this to web.config

        var root = HttpContext.Current.Server.MapPath(uploadFolder);

        Directory.CreateDirectory(root);

        return new MultipartFormDataStreamProvider(root);

    }

    // Extracts Request FormatData as a strongly typed model

    private object GetFormData<T>(MultipartFormDataStreamProvider result)

    {

        if (result.FormData.HasKeys())

        {

            var unescapedFormData = Uri.UnescapeDataString(result.FormData

                .GetValues(0).FirstOrDefault() ?? String.Empty);

            if (!String.IsNullOrEmpty(unescapedFormData))

                return JsonConvert.DeserializeObject<T>(unescapedFormData);

        }

        return null;

    }

    private string GetDeserializedFileName(MultipartFileData fileData)

    {

        var fileName = GetFileName(fileData);

        return JsonConvert.DeserializeObject(fileName).ToString();

    }

    public string GetFileName(MultipartFileData fileData)

    {

        return fileData.Headers.ContentDisposition.FileName;

    }

////////////////////////////////

$.ajax({

        type: "POST",

        enctype: 'multipart/form-data',

        url: "/api/File",

        data: data,

        processData: false,

        contentType: false,

        cache: false,

        timeout: 600000,

        success: function(data) {

            console.log("SUCCESS : ", data);

            $("#BtnImportar").prop("disabled", false);

        }

});