ASP.NET Server-side Flow Authentication and getting access token

I need some help here. I'm trying do come up with a server-side flow authentication with the below code (it is a ASP.NET button)

protected void ServerSide_Click(object sender, EventArgs e)
{
    Response.Redirect(
        "https://www.facebook.com/dialog/oauth?client_id=***************&redirect_uri=MYURI&scope=email,offline_access,&response_type=token"
    );
}

However, when the button is clicked, and the user click on Allow button after sign in to Facebook, the browser URL path on the Address bar shows something like the below:-

http://MYURL#access_token=***************%7Cd4aa713668298c84a9f74c19.1-***************%7C295Xjb6r-PvLc_l-rKOJ-Lbk5gI&expires_in=0

How do I get something like th开发者_C百科e below in order for my server to post back to facebook with my app secret?

http://YOUR_URL?code=A_CODE_GENERATED_BY_SERVER

What should I do?

Remove the response_type=token from the URL. That is used for client side flow.