case select question

[vb_student]

Hello

I originally had the following code

 Select Case txtCar.Text
        Case is <= 2500
            msg = MsgBox("Car Price not recommended for this model. Are you sure you want to use this Price", vbQuestion)
        Case is <= 4000
            save_parameters
            NodeBAll.SaveTab2.Enabled = False
            NodeBAll.MousePointer = 0
            'do nothing
        Case Else
            msg = MsgBox("Car Price not recommended for this model. Are you sure you want to use this Price", vbQuestion)
    End Select

whenever i had a txtcar value of say 35000, it would still og through the second case (case is <=4000). i changed the code to the code below

 Select Case txtCar.Text
        Case txtCar.Text <= 2500
            msg = MsgBox("Car Price not recommended for this model. Are you sure you want to use this Price", vbQuestion)
        Case txtCar.Text <= 4000
            save_parameters
            NodeBAll.SaveTab2.Enabled = False
            NodeBAll.MousePointer = 0
            'do nothing
        Case Else
            msg = MsgBox("Car Price not recommended for this model. Are you sure you want to use this Price", vbQuestion)
    End Select

and it works, i was wondering why does not the is operator work?