vb6 - C# Byte Handling -

i'm experiencing bit of issue while trying convert vb6 logic c#. in 1 of vb6 functions, has following statement:

w = not cbyte(w) 

where w long.

in example, after line evaluates in vb6, can see following change:
before: w = 110
after: w = 145

however, in c#, i've rewritten method contain following code:

w = ~(byte)w; 

but, when run same example, these results, instead:
before: w = 110
after: w = -111

i same result doing:

w = ~(convert.tobyte(w)); 

i able correct results following change:

w = ~(byte)w & 0xff; 

from can tell, looks c# converting sbyte though it's not specified so. question is: there flaw in logic? way vb6 equivalent?

w long, let's it's int, doesn't matter except it's easier explain.

w = ~(byte)w; 

ok, w cast byte .. , int because that's arithmetic operations do.

you solve taking justin's suggestion comments (which cast @ right moment: (byte)~w), or this:

w ^= 0xff; 

that not strictly same thing though, it's different if w starts out value outside of range of byte.