c# - Bring dialog window to front -

i showing window on button click this:

private void showwindow(object obj) {     var dialog = new additemview();     dialog.show(); } 

if button clicked again, while window still open, how bring window front , not create new one?

just store dialog object , check whether it's been created in showwindow.

used windows closed event clear reference dialog object.

additemview dialog;  private void showwindow(object obj) {      if ( dialog == null )     {        dialog = new additemview();        dialog.show();        dialog.owner = this;        dialog.closed += new eventhandler(additemview_closed);     }     else        dialog.activate(); }  void additemview_closed(object sender, eventargs e)     {          dialog = null;     }