In vb.net, the normal looping construct (a "For/Next loop") will execute the loop with values up to and including the maximum value specified, unlike C which can easily loop with values below the upper limit. Thus, it is often necessary to specify a loop as e.g. "For I=0 To Array.Length-1"; if Array.Length were unsigned and and zero, that could cause an obvious problem. Even in C, one benefits from being able to say "for (i=Array.Length-1; i GE 0; --i)". Sometimes I think it would be useful to have a 31-bit integer type which would support widening casts to both signed and unsigned int, but I've never heard of a language supporting such.
