1  public static async Task<string> UploadFileAsync(string url ,string path)
 2         {
 3             using (var client = new HttpClient())
 4             {
 5                 using (var content = new MultipartFormDataContent("Upload----" + DateTime.Now.Ticks.ToString("x")))
 6                 {
 7                     var upfilebytes = File.ReadAllBytes(path);
 8                     var ms = new MemoryStream(upfilebytes);
 9                     content.Add(new StreamContent(ms), "file", "upload.jpg");
10                     using (var httpResponseMessage = await client.PostAsync(url, content))
11                     {
12                         var responseContent = "";
13                         if (httpResponseMessage.IsSuccessStatusCode)
14                         {
15                             responseContent = await httpResponseMessage.Content.ReadAsStringAsync();
16                         }
17                         return responseContent;
18                     }
19                 }
20             }
21         }