Question

I have three forms named frmBase(form1),frmGraph(form2) and frmBalloon(form3).

frmGraph(form2) opens if the user clicks on the button named btnShow placed on frmBase(form1).

frmBalloon(form3) opens if the user clicks on the button named btnShow placed on frmGraph(form2).

Now if the user clicks on the button named btnCancel placed on the frmGraph(form2) OR clicks on the button named btnCancel placed on the frmBalloon(form3) every form that is open should be closed except frmBase(form1).

So, every forms should be closed except mainform when user clicks on the button placed on the form2 or form3. So for that is there any solution?

Answer 1

It is not a great solution, Application.OpenForms is a bit unreliable, but easy:

public static void CloseAllFormsButMain() {
  for (int ix = Application.OpenForms.Count - 1; ix > 0; --ix)
    Application.OpenForms[ix].Close();
}