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Public Function IsFormOpen(ByVal frm As Form) As Boolean If Application.OpenForms.OfType(Of Form).Contains(frm) Then Return True Else Return False End If End Function Private Sub btnFind_Click(sender As System.Object, e As System.EventArgs) Handles btnFind.Click If IsFormOpen(frm_Printers_SearchResult) Then MsgBox("open") End If End Sub
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