Delete attachments in private messages in Yammer

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ASP.NET

Progress on Problem 2
=================
When we try to delete the private attachments via HTTP Delete (passing file_api_url with Auth token), it is throwing 401 (Unauthorized error) from inside/outside cognizant network. Also this is not getting executed via browser as well, as discussed, it would be really helpful if you can send some examples or code snippets for this case.

private static void DeleteAttachments(string DeleteURL)
{
HttpClient Client = new HttpClient();
HttpResponseMessage myWebResponse;

try
{
myWebResponse = Client.DeleteAsync(DeleteURL + "?access_token=xxxxxxxxxxxxxxx").Result;

if (myWebResponse.IsSuccessStatusCode)
{
Console.Out.WriteLine("Success");
}
else
Console.Out.WriteLine("Failed");
}
catch (Exception e)
{
Console.Out.WriteLine(e.Message);
}
finally
{
Client.Dispose();
myWebResponse = null;
}

}