title: How to send appsecret_proof using facebook c# SDK?
body: <p>I want to use "Require App Secret" (Require app secret for server API calls) on my facebook app,
  But if I do - I'm getting the following error:</p>
  
  <blockquote>
    <p>(GraphMethodException - #100) No appsecret_proof parameter was specified</p>
    
    <p>Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. </p>
    
    <p>Exception Details: Facebook.FacebookApiException: (GraphMethodException - #100) No appsecret_proof parameter was specified</p>
    
    <p>Source Error: </p>
    
    <p>Line 801:                            var fb = new FacebookClient(accessToken);
    Line 802:
    Line 803:                            <strong>dynamic facebookInfo = fb.Get("/me?appsecret_proof=" + fb.AppSecret + "&amp;fields=email,birthday,gender");</strong>
    Line 804:                            signInInfo.Email = facebookInfo.email;
    Line 805:</p>
  </blockquote>
  
  <p>I saw <a href="https://stackoverflow.com/questions/20572523/c-sharp-help-required-to-create-facebook-appsecret-proof-hmacsha256">this post</a>, so I'm trying to understand how to send it... do I need to switch to fb.Post ?</p>
  
  <p>Also, I wonder if the SDK does not already have something like "GenereateFaceBookSecret()"</p>
  
  <p>Thanks in advance.</p>