//if (!Page.IsValid)
        //    return;
        
        //MembershipUser member= Membership.GetUser();
        //Guid currentUserId=(Guid)member.ProviderUserKey;

        //string conn =
        //    ConfigurationManager.ConnectionStrings["SecurityTutorialsConnectionString"].ConnectionString;
        //string insertsql = "Insert into GuestbookComments(Subject,Body,UserId) values(@Subject,@Body,@UserId)";

        //using (SqlConnection myConnection = new SqlConnection(conn))
        //{
        //    myConnection.Open();
        //    SqlCommand cmd = new SqlCommand(insertsql, myConnection);
        //    cmd.Parameters.AddWithValue("@UserId", currentUserId);
        //    cmd.Parameters.AddWithValue("@Subject", Subject.Text.Trim());
        //    cmd.Parameters.AddWithValue("@Body", Body.Text.Trim());
        //    cmd.ExecuteNonQuery();
        //    myConnection.Close();
        //}

        //Subject.Text = null;
        //Body.Text = null;