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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim id, pw As String
        id = TextBox1.Text
        pw = TextBox2.Text
        If id = "jack" And pw = "luck007" Then
            MsgBox("歡迎進入圖書資訊系統", , "系統提示")
        Else
            MsgBox("帳號或密碼輸入錯誤", , "系統提示")
        End If
    End Sub

請注意：密碼欄要隱藏