'フォーム全体を表すクラス
Public Class Form1
    Inherits System.Windows.Forms.Form

    'フォームに貼り付けたコントロールを表すクラス。
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button

    ・・・

    'ボタンがクリックされたときの処理
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
    Handles Button1.Click
        ・・・
    end sub
End Class