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JMO9966

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VB.Net is there a function to return the difference between two values?

I need to compare a zero or greater value to a value that may be negative and return the difference between the two values as a positive number  these variables are all stored as data type Double.
 
For example:  

Value 1 = 17
Value 2 = -4

Would like function to return 21.

Thanks,
Jon
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ptakja
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JMO9966

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I ended up turning the negative number value2 into a positive and adding to value1.

If FutureBalance < OrderPoint And FutureBalance < 0 Then
            FutureSuggOrder = Math.Abs(FutureBalance) + OrderPoint
        ElseIf FutureBalance < OrderPoint And FutureBalance >= 0 Then
            FutureSuggOrder = OrderPoint - FutureBalance
        Else
            FutureSuggOrder = 0
        End If