Automation event calls multiple time but for open dialogue not raised? C# automation UI

See more:

.NET

C#3.5

UI

automation

I Have an add automation event that raised on new windows open from that windows i get the localized control type dialogue then i used it in my function so the problem is that it raised multiple time when ever dialogue is open and also it does not raised some time for open and save as dialogue how ever if raised but multiple times so here is what i am codding

Automation.AddAutomationEventHandler(
              WindowPattern.WindowOpenedEvent,
                AutomationElement.RootElement,
                        System.Windows.Automation.TreeScope.Subtree,
                               (sender, e) =>
                               {
                                   var element = sender as AutomationElement;
                 if (element.Current.LocalizedControlType == "Dialog")
                                   {

                                   }
                               });

         System.Console.ReadKey();
         Automation.RemoveAllEventHandlers();

now what is the mistake i am doing why it is calling multiple time but not for open and save as dialogue box ?

What I have tried:

i want to raise an event in my code when ever a new windows specially dialogue box opens so here is above code i have written code is working but event raised multiple time suppose print box opens it repeats 2 times and not working for open and save as dialogues boxes if some time works works with much delay of time that i have to sit but not for other events