public string get_auth_url() {
string returnurl = null;
string url = this.get_dashboard_url() + "/auth";
var param = new { response_type = "code", client_id = this.client_id, redirect_uri = this.get_current_url(), scope = this.scope, state="1234" };
returnurl = this.create_get_url(url, param);
//_auth = new Auth();
//string authurl = _auth.get_auth_url();
return returnurl;
}