HttpClient POST to Web API returns 400 Bad Request

I am trying to post captured image from WPF to WebApi method using HttpClient but i am getting 400 BAD REQUEST error.

I have tried in google but unable to resolve the issue. does anyone help me.

Below is the code in WPF

private async void btnLogin_Click(object sender, RoutedEventArgs e)

{

string FileName =

System.IO.Path.GetFullPath("../../captured_images") +

"//captured_image" + DateTime.Now.Day.ToString() +

DateTime.Now.Month.ToString() + DateTime.Now.Year.ToString() +

DateTime.Now.Second.ToString() + ".jpg";

var encoder = new PngBitmapEncoder();

encoder.Frames.Add(BitmapFrame.Create((BitmapSource)image.Source));

using (FileStream stream = new FileStream(FileName,

FileMode.Create))

encoder.Save(stream);

string CASAAuthResponse = await

CASSecurity.GetAuthenticationToken();

CASAuthTokenResponse techSeeTokenResponse =

JsonConvert.DeserializeObject

(CASAAuthResponse);

HttpContent fileStreamContent = new StreamContent(File.OpenRead(FileName));

using (var client1 = new HttpClient())

using (var formData = new MultipartFormDataContent())

{

client1.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

formData.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data");

formData.Add(fileStreamContent, "face",

Path.GetFileName(FileName));

var response = await

client1.PostAsync(CASIdentifyFaceUrl, formData);

if (!response.IsSuccessStatusCode)

{

return null;

}

Server Web api:

[HttpPost]

[Route("identify")]

public async Task Identify(IFormFile face)

{

Guid temporaryUsername = Guid.Empty;

using (var faceStream = face.OpenReadStream())

{

temporaryUsername = await verifyBusiness.IdentifyUser(faceStream,

new Guid(Requester.ClientId));

}

return Ok(temporaryUsername);

}

> And i am getting error as descibed below:

{StatusCode: 400,

> ReasonPhrase: 'Bad Request', Version: 1.1, Content:

> System.Net.Http.StreamContent, Headers: { Transfer-Encoding: chunked

> Strict-Transport-Security: max-age=2592000 Date: Thu, 20 Jun 2019

> 11:13:28 GMT Set-Cookie:

> ARRAffinity=4cbc3e777eee0146fcbb9f695794b29417cc953731f6f8f581457a1d7cd7aa14;Path=/;HttpOnly;Domain=cas-qa.tempdata.net

> Server: Kestrel X-Powered-By: ASP.NET Content-Type:

> application/json; charset=utf-8 }}