DateTime precision?

Question

(ignoring the optimized compiler flag )

can it be that this code will enter the block on some systems ?

if (Datetime.Now!=Datetime.Now)
{
 ...
}

I mean , how does it evaluate the values here ? (is it by order) ?

Is there any situations where the condition might be true ?

again , ignore the optimized flag.

Answer 1

DateTime has a precision of 100ns. But on typical implementations, DateTime.Now only changes every few milliseconds.

Datetime.Now != Datetime.Now can be true, but it's extremely unlikely to happen. This is a typical race conditions of the kind you often see in multi-threaded code. i.e. you should not rely on DateTime.Now not changing, but rather store a copy in a local variable.