How do I test and set the insert/overwrite keyboard mode from VB.NET?

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Imports System.Runtime.InteropServices

Public Class Win32
    Declare Auto Function GetKeyState Lib "user32.dll" _
        (ByVal nVirtKey As Integer) As Integer
End Class

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button1.Click
        ' &H2D is VK_INSERT.
        Dim x As Integer = Win32.GetKeyState(&H2D)
        If (&H1 = (&H1 And x)) Then
            Label1.Text = "Insert key down"
        Else
            Label1.Text = "Insert key up"
        End If
    End Sub
End Class