HTTPWebClient MultiPart Upload

Using .net httpClient. we need to replicate s format for a RESTFUL PUT statement using multipartform upload in the content. There are 3 items GroupId , PhotoId and the image itself The content packet needs to look exactly like this: ------WebKitFormBoundaryTAfxe9HopeoFTY9R Content-Disposition: form-data; name="GroupId" 3acb836b-d45a-43e2-ba79-82f3cbf8b8d5 ------WebKitFormBoundaryTAfxe9HopeoFTY9R Content-Disposition: form-data; name="PhotoId" 694a7a02-3c8f-427f-9aee-15a8ca1073ef ------WebKitFormBoundaryTAfxe9HopeoFTY9R Content-Disposition: form-data; name="file"; filename="[login to view URL]" Content-Type: application/octet-stream <file content goes here> Here is a link to the exact docs [login to view URL]