Getting negitive Number

Can somoen please explain to me why I would get a negative number if I enter 355 into the textbox.

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Private mdblHouseSqFt As Double = 0
Select Case txtHomeSqFt.Text
            Case 0 To 1000
                mdblHouseSqFt = txtHomeSqFt.Text * 0.1
            Case 1001 To 2000
                mdblHouseSqFt = ((txtHomeSqFt.Text - 1000) * 0.11) + 100
            Case 2001 To 3000
                mdblHouseSqFt = ((txtHomeSqFt.Text - 2000) * 0.12) + 210
            Case 3001 To 4000
                mdblHouseSqFt = ((txtHomeSqFt.Text - 3000) * 0.13) + 330
            Case Else
                mdblHouseSqFt = ((txtHomeSqFt.Text - 4000) * 0.14) + 460
        End Select
txtTaxOnHome.Text = mdblHouseSqFt
-----------------------------------------------------------

Thanks.
JedidiaAsked:
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Because you are using a string as the case parameter but the values in your case statements are numbers so it is jumping to the Case Else all the time.

Change

    Select Case txtHomeSqFt.Text

to

    Select Case CInt(txtHomeSqFt.Text)

~IM
0

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