AutoCAD Inventor :: Why Does Round() Require Object For Decimal Places

Why does the Round() function require that the number of decimal places be either a number or an object if you want to use a variable? It seems that a Single should work here, but iLogic won't accept it.

See sample code below which is rounding off dimension values. If I dim the variable "somenumber" as Single or Double, I get this error message from the Round() function: "Overload resolution failed because no accessible 'Round' can be called without a narrowing conversion."

When I dim "somenumber" as an object it works, but this seems unnecessary when all it is storing is a single digit number. Why wouldn't Single or Double work for this variable?

Here's the code snippet:

'Dim Current Sketch & Count Constraints
Dim oSketch As Sketch = ThisApplication.ActiveEditObject
Dim oDimCount As Single = oSketch.DimensionConstraints.Count

[Code]....