How can I check that if the form is already open?

[Shelby]

Hi,
how can I check that if the form is already open?
Whenever I click on a button, it will open the form.
I would like to check if the form is open.

 

[William Ryan eMVP]

You can have as many instances of a given form created/open as you want
(memory allowing). You may want to implement a Singleton pattern
http://www.yoda.arachsys.com/csharp/singleton.html to limit the instances
but short of that, it's hard to say b/c there's not just one instance of a
given form to check for.

--
W.G. Ryan MVP Windows - Embedded

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[David Williams , VB.NET MVP]

Assume that the form that you want to check on is Form2. In the Click
event of the button (on Form1)

If Form2 Is Nothing OrElse Not Form2.Loaded Then Form2.Load

HTH

David

 

[Cor Ligthert]

Shelby,

I prefer it to disable the button when a form is opened and when it is
closed to enable the button again.

Cor