Check if form is Opened

Question

I give this question for more knowledge. How can I know if the form is Opened in my application or not, in order not to open it again I mean not to create an instance of the

Answer 1

For more simplicity you may create a public static bool variable which will tell whether the form is opened or not. On form load event assign 'true' and on closed event assign 'false' value.

Answer 2

Hate to be a kill joy but some day some one is going to try and understand your code.

Dim frm as New frmDontknow
Dim frmCollection = System.Windows.Forms.Application.OpenForms
For i As Int16 = 0I To frmCollection.Count - 1I
  If frmCollection.Item(i).Name = frm.Name Then
      frmCollection.Item(i).Activate()
      Exit Sub
  End If
Next i

Then do the show etc as required?