VB 乘法 与 加法问题

我学过C C++ Java 等语言， 他们用加法 很简单， 
现在看了看 VB， 写了一个简单的程序， 可是
overTimes * 1.5 * wage + wage * hourse 这行报错，是表达式错误。 我不太清楚问题在哪里，请教一下大家。谢谢
VB.NET code:


Public Class calculator

Private Sub ButtonExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonExit.Click
Me.Close()
End Sub

Private Sub ButtonCalculator_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonCalculator.Click
Dim wage As Double
Dim result As Double
Dim hourse As Double

hourse = Val(TBHourse.Text)
wage = Val(TBWage.Text)

If hourse < 40 Then

result = wage * hourse
Else
Dim overTimes As Double
overTimes = hourse - 40
[color=#FF0000]overTimes * 1.5 * wage + wage * hourse[/color]
End If
LBresult.Text = TBName.Text & " is :" & result

End Sub
End Class

---

overTimes * 1.5 * wage + wage * hourse 
VB的代码按LZ这么写必然报错
解决方法:
1)在前加'注释掉
VB code:
'overTimes * 1.5 * wage + wage * hourse

2)按要求写成等式,这须按