Arithmetic operation resulted in an overflow - Only in Release mode

Hallo,

I have a simple Object read-only Property "Length " which gives me an Arithmetic operation that resulted in an overflow, the application runs without any problem or error when "Debug and AnyCPU" are set. But it gives an error when I set it to Release & AnyCPU.

Whatever the if statement to make sure if the Num & Num2 are greater than 0 does not help. Any idea how to solve this problem?

 Public Class Test
    
 Public Property Num2 as integer
    
 Public Readonly Property Length as long?
    Get
            Dim Num as long
            Return  Num * (Num2 /100)
     End Get
 End property
    
 End Class

Thanks