How to limit number of child form in parent form.

How to limit number of child form in parent form.

• Bryce Covert

  Hi,
  
  One way to limit this is to have a static variable that gets incremented each time, you instantiate a new form. In the Form_Closing event of all the forms you would need to decrement the same variable.
  
  Once the variable reaches a particular count, you say the user has exceed maximum number of child forms.
  
  Regards,
  Vikram
  
  

• NarasimhaMurthy

  I think what your asking for is a singleton class.  You want just one instance of a class to be able to be opened right Here is an example of how to implement a singleton class. Where ever the class is instantiated you would want to call it like this
  
  //create the new screen
  Landing LandingScreen = Landing.Instance();
  
  //Display Screen
  LandingScreen.Show();
  
  

  now in the constructor region of the class that you are instantiating add code that looks like this
  
  private static Landing aLanding = null;
  
  public static Landing Instance()
  {

      if(aLanding==null)
      {
          aLanding= new Landing();
      }
     else
      {
      }
      return aLanding;
  }
  
  private Landing()   // note that this has changed to from public to private
  {
       InitializeComponent();
  }

  And that's it now the form may only be opened once!
  
  
  

  
  
• How to limit number of child form in parent form.