The sample VB.net code for comparison contains both syntax and logic errors.

In VB.Net, an IF is ended by "End If", not End.

Also, "If result = number * Factorial(number - 1)" is attempted assignment and comparison and produces an incorrect result. If you run this code, you always get zero as a result.

Refactored code:

Private Function Factorial(ByVal number As Integer) As Integer

  If number = 0 Then

    Return 1

  Else

    Return (number * Factorial(number - 1))

  End If

End Function