Need to retrieve WIndows Title Bar Height!!!

I am writing an application in VB.NET and would like to retrieve the Windows Title Bar height.

I have found that between Windows 2000 and Windows XP they have a different height as Windows XP seems to be a little larger.

Can anybody help me please???

See this :

VB Code:

MessageBox.Show(Me.Height - Me.ClientSize.Height)

It calculates the size of the form excluding title bar .