private void Btn_Click_LogIn(object sender, RoutedEventArgs e) { CurrentUser.username = txtBox_Username.Text; CurrentUser.password = txtBox_Password.Text; bool loginSucces = DB.UserLogin(); if (CurrentUser.currentUserID > 0) { CreateMessage.ShowSuccesfulLogin(); this.Content = null; } if (CurrentUser.currentUserID == 0) { CreateMessage.ShowUnsuccesfulLogin(); } }