TextBoxにフォーカスがあるとき、ButtonをクリックしたらTextBoxのフォーカスを取得できるようにしたい

    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

        If TextBox1.Focused = True Then
            Console.WriteLine("TextBox1 にフォーカスがあります")

        ElseIf TextBox2.Focused = True Then
            Console.WriteLine("TextBox2 にフォーカスがあります")

        ElseIf TextBox3.Focused = True Then
            Console.WriteLine("TextBox3 にフォーカスがあります")

        Else
            Console.WriteLine("現在選択されているコントロールは、{0}です。", _
                Me.ActiveControl.Name)

        End If

    End Sub

Public Class Form1

    Private c As Control = Nothing

    Private Sub TextBox1_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.Leave
        c = DirectCast(sender, Control)
    End Sub

    Private Sub TextBox2_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.Leave
        c = DirectCast(sender, Control)
    End Sub

    Private Sub TextBox3_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox3.Leave
        c = DirectCast(sender, Control)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        If c IsNot Nothing Then
            c.Focus()
        End If

    End Sub

End Class