graphics.DrawIcon（）不在表单上绘制

Question

我有一个简单的表单，我想从磁盘上绘制一个Icon文件。

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim g As Graphics = Me.CreateGraphics()
    'Dim theIcon As Icon = LoadIconFromFile("c:\Users\blabla\pmt.ico")
    Dim theIcon As Icon = New Icon("c:\Users\blabla\pmt.ico",New Size(64, 64))
    g.DrawIcon(theIcon, 20, 20)
    g.Dispose()
    theIcon.Dispose()
End Sub

但是表单上没有任何图像。 你知道我做错了什么吗？ 谢谢！