I have this code sample that was posted as an answer to another question ([Send a file via HTTP POST with C#](https://stackoverflow.com/questions/1131425/send-a-file-via-http-post-with-c-sharp)). It works fine except for one issue. It surrounds the boundary in the HTTP header with double quotes:

multipart/form-data; boundary="04982073-787d-414b-a0d2-8e8a1137e145"

This is choking the webservice that I'm trying to call. Browsers don't have those double quotes. I need some way to tell .NET to leave them off.

```
private System.IO.Stream Upload(string actionUrl, string paramString, Stream paramFileStream, byte [] paramFileBytes)
{
    HttpContent stringContent = new StringContent(paramString);
    HttpContent fileStreamContent = new StreamContent(paramFileStream);
    HttpContent bytesContent = new ByteArrayContent(paramFileBytes);
    using (var client = new HttpClient())
    using (var formData = new MultipartFormDataContent())
    {
        formData.Add(stringContent, "param1", "param1");
        formData.Add(fileStreamContent, "file1", "file1");
        formData.Add(bytesContent, "file2", "file2");
        var response = client.PostAsync(actionUrl, formData).Result;
        if (!response.IsSuccessStatusCode)
        {
            return null;
        }
        return response.Content.ReadAsStreamAsync().Result;
    }
}

```