C# File upload through API Bad request error

Question

Hi all i have been trying to post files for a third party tool through rest api with MultipartFormDataContent. Even though i am writing files to MultipartFordatacontent in byte arry i am receiving error saying "400 bad request no filedata section found in multipart post request".

Request:

Method: POST, RequestUri: 'url', Version: 1.1, Content: System.Net.Http.MultipartFormDataContent, Headers:

{

Content-Type: multipart/form-data; boundary="c4757eb4-aefd-450a-a5cc-e879ac7f37ce"

Content-Length: 185

}

--c4757eb4-aefd-450a-a5cc-e879ac7f37ce

Content-Disposition: form-data; name=filedata; filename=pp.txt

Content-Type: text/plain

test file

--c4757eb4-aefd-450a-a5cc-e879ac7f37ce--

Response:

StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:

{

x-transaction-id: 99999_staging_1537571048380:f4eb3ca701:28:jm91oq79:10113

vary: accept-encoding

Connection: keep-alive

Cache-Control: no-cache

Date: Fri, 21 Sep 2018 23:04:08 GMT

Content-Length: 104

Content-Type: application/json; charset=utf-8

}

{"statusCode":400,"error":"Bad Request","message":"No filedata section found in multipart POST request"}