在文本框中输入密码，“验证密码”按钮检验输入的是否为“123456”。“清空”按钮清空文本框。“结束”按钮关闭窗体。

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim P$
        P = Trim(TextBox1.Text)
        If P = "123456" Then
            Label2.Text = "密码正确"
        Else
            Label2.Text = "密码错误"
        End If

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        TextBox1.Text = ""
        Label2.Text = ""
        TextBox1.Focus()
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Close()
    End Sub
End Class