Zalo for Developer - Upload hình lên zalo page qua code C# web asp.net MVC

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Zalo fo Developer - Upload hình lên zalo page qua code C# web asp.net MVC

var endpointUrl = "https://openapi.zalo.me/v2.0/store/upload/photo?access_token=" +
                        BasePage.SessionLogin.Zalo_Token + "&upload_type=product";
                   //var filePaths = new DirectoryInfo("W:\\Temp").GetFiles().Select(f => f.FullName);
                    using (var client = new HttpClient())
                    using (var formData = new MultipartFormDataContent())
                    {
                        //foreach (String filePath in filePaths)
                        //{
                        //    formData.Add(new ByteArrayContent(System.IO.File.ReadAllBytes(filePath)), Path.GetFileNameWithoutExtension(filePath), Path.GetFileName(filePath));
                        //}
                        string filePath = Path.Combine(Server.MapPath("~/Images/Products/900/"),
                                     Path.GetFileName("0.jpg"));
                        formData.Add(new ByteArrayContent(System.IO.File.ReadAllBytes(filePath)), "file", Path.GetFileName(filePath));

                       filePath = Path.Combine(Server.MapPath("~/Images/Products/900/"),
                                    Path.GetFileName("1.jpg"));
                        formData.Add(new ByteArrayContent(System.IO.File.ReadAllBytes(filePath)), "file", Path.GetFileName(filePath));

                        var response = client.PostAsync(endpointUrl, formData).Result;
                        if (response.IsSuccessStatusCode)
                        {
                            var responseData = response.Content.ReadAsStringAsync().Result;
                            var data = JsonConvert.DeserializeObject<Zalo_Up_img>(responseData);
                            Trace.Write(responseData);
                        }
                        return Json(Result);
                    }