请问在VB.NET中如何改变BMP图形的大小

请问在VB.NET中如何改变BMP图形的大小
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试试看，应该行的：
Dim g As System.Drawing.Image
Dim newWidth, newHeight As Integer
g = System.Drawing.Image.FromFile("c:\aaa.bmp") '读入图片
'变化大小
newWidth = CInt(g.Width / 2)
newHeight = CInt(g.Height / 2)
'存图片
Dim g2 As New System.Drawing.Bitmap(g, newWidth, newHeight)
g2.Save("c:\kkk.bmp")