Find if a number is part of a range

Hi there,
I have a little bit of an issue. I need to find out if a number is part of a giving range.
I have the following code:
Dim dt as new datatable
Dim dtrow as datarow
Dt = loaddata()

For each dtrow in dt.rows then
Dim str as string = dtrow.items("unit").tostring()
Dim range as string = dtrow.items("range").tostring()
'Some how in here I need create a function or sub that will tell me if the str is in my range or not

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The datatable has units like this
And ranges are like this:
2 to 5
6 to 20
21 to 50
50 >
For the bigger numbers those are dollars amounts and behave the same way.
How can I do this?
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
you can try create a function accordingly for comparison.

Function findRange(v As Double) As String
       Select Case v
         Case Is > 50
                  Return "50 >"
         Case Is >= 21
                  Return "21 to 50"
         Case Is >=6
                  Return "6 to 20"
         Case Is >=2
                  Return "2 to 5"
         Case Is =1
                  Return "1"
         Case Else
                  Return "< 1"
       End Select
End Function

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myRange = findRange(Convert.ToDouble(dtrow.items("range").tostring()))

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COHFLAuthor Commented:
This will not work because the amount I have provided were sample ones and they vary depending on the category they are in.
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
what kind of "Categories" need to be defined here? How you define these categories?
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Visual Basic.NET

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