System.Runtime.InteropServices.COMException error when using .Range method

[Shamil]

Hi All,

I just wanted to inform you about error I found and which I dont have clear explanation to:

1. This code doesnt work

Dim doc as Word.Document
dim rng as Word.Range
Dim lngStart As Long
Dim lngEnd As Long

lngStart = 3
lngEnd = 10
rng = doc.Range(lngStart, lngEnd)

and results in error:

An unhandled exception of type System.Runtime.InteropServices.COMException occurred in MSWordAutomationVBNet.exe

Additional information: Type mismatch

2. This code works well:

Dim doc as Word.Document
dim rng as Word.Range
Dim lngStart As Long
Dim lngEnd As Long

lngStart = 3
lngEnd = 10
rng = doc.Range(CType(lngStart, Integer), CType(lngEnd, Integer))


Explicit cast to Integer makes the difference but its unclear why its needed for a function with a signature:

Public Overridable OverLoads Function Range([byref Start as Object],[ByRef End as Object]) as Word.Range

Anybody and clues?

Shamil