How to determine whether a form is disabled

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If there is a variable F2 in form1, this variable points to a form2 instance. The form2 window is displayed when the f2.show () method is used in form1. However, when the form2 window is closed by the user, there is still an instance in form1 where F2 points to a form2,That is, F2 will not point to null, even if form2 has been disabled.At this time, how can we determine that the form2 variable pointed to by F2 has been disabled? When a window is closed, it calls its own dispose method to release the resources occupied by this window. Therefore, you canCodeTo determine the value of f2.isdisposed. If it is true, form2 is disabled.That is, the isdisposed attribute can determine whether a window is closed.