vb.net form關閉前詢問 [Ask before close]

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Private Sub frmSeparar_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing If blnNoneSave = True Then If MsgBox("尚未儲存，是否確定要關閉分組系統？", MsgBoxStyle.YesNo + MsgBoxStyle.Question, "詢問") = MsgBoxResult.No Then e.Cancel = True End If End If End Sub