Circle Area (with If Then Statements)

Syntax, once again, is very complicated. I originally wrote the text for the program to calculate circle area so that:

radius = Val(Me.txtRadius.Text)

        If radius < 0 Then

            Me.lblArea.Text = "Negative radii are illegal."

        End If

        area = PI * (radius ^ 2)

        Me.lblArea.Text = area 'Shows answer of area of circle

This should have resulted in no answer displaying if the radius entered was negative. However, an answer still showed up when I pressed Debug, so I went back and rearranged things:

radius = Val(Me.txtRadius.Text)

        area = PI * (radius ^ 2)

        Me.lblArea.Text = area 'Shows answer of area of circle

        If radius < 0 Then

            Me.lblArea.Text = "Negative radii are illegal."

        End If