Upload file to Server

file.cs

[HttpPost]
[AjaxValidationAntiForgeryToken]
public JsonResult UploadFileToServer(HttpPostedFileBase file, int? id, string deleteFile)
{
    var response = new JsonResultBody();

    try
    {
        response.Status = System.Net.HttpStatusCode.OK;

        if(file != null)
        {
            var folder = $"{DateTime.Now.ToString("yyyy-MM-dd")}";
            var url = Server.MapPath($"~/Files/OportunidadesMejora/{folder}/{id}/");

            //Revisar si existe el directorio, sino crearlo
            if (Directory.Exists(url) == false)
                Directory.CreateDirectory(url);

            var fileToUpload = $"{file.FileName}";
            var fileExtension = Path.GetExtension(fileToUpload);

            string filename = Path.GetFileNameWithoutExtension(fileToUpload);
            file.SaveAs(url + filename + fileExtension);

            response.Data = new {
                Mensaje = $"El archivo {evidencia.Nombre} se ha guardado correctamente"
            };
        }
    }
    catch (DbEntityValidationException ex)
    {
        response.Status = System.Net.HttpStatusCode.InternalServerError;
        foreach (DbEntityValidationResult result in ex.EntityValidationErrors)
        {
            response.Errors = (from ve in result.ValidationErrors select ve.ErrorMessage).ToList();
        }
    }
    catch (Exception exAplicacion)
    {
        response.Status = System.Net.HttpStatusCode.InternalServerError;
        response.Errors.Add(exAplicacion.Message);
    }

    return Json(response);
}