ArraySum - The sum of an array of any numeric type

' The sum of an array of any numeric type
'
' Example:
'   Dim arr As Integer() = {3, 7, 8, 2, 0, 9}
'   MessageBox.Show(ArraySum(arr))

Function ArraySum(ByVal arr As Array) As Double
    Return ArraySum(arr, arr.GetLowerBound(0), arr.GetUpperBound(0))
End Function

' This overloaded version allows you to specify which portion of the array 
' should be considered
Function ArraySum(ByVal arr As Array, ByVal first As Integer, _
    ByVal last As Integer) As Double
    Dim i As Integer
    Dim sum As Double

    For i = first To last
        sum += CType(arr(i), Double)
    Next

    Return sum
End Function