There are several possibilties. One of them would be to create a class
deriving from Form which would have a static property returning the list of
windows (forms) of your application. The constructor of this class would
add itself to this static list of windows. Then, whenever you create a new
Form in your application, derive from your custom Form class instead of
using the standard .NET Form class so that each time you instanciate a new
window, it automatically adds itself to the list of windows of your
application.

Hi Brian,

Thank you for posting.

I think the solution of Mehdi is good. What I want to supplement to the
Mehdi's solution is that you should remove the form instance from the
static list of forms when the form instance is closed.

Here is a sample for you.
// the BaseForm is a base class for all other form classes in the project
public partial class BaseForm : Form
   {
       public BaseForm()
       {
           InitializeComponent();
           _InstanceList.Add(this);
       }    

       private void BaseForm_FormClosed(object sender, FormClosedEventArgs
e)
       {
           _InstanceList.Remove(this);
       }

       private static Collection<BaseForm> _InstanceList = new
Collection<BaseForm>();
       public static Collection<BaseForm> InstanceList
       {
           get { return _InstanceList; }
       }      
   }

If there's anything unclear, don't hesitate to get in touch. I look forward
to your reply.

Sincerely,
Linda Liu
Microsoft Online Community Support

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