Question about the "switch" statement

Hey guys, quick question.

When you use a switch statement, does it evaluate the condition once or every time it is tested against a case? I imagine it would be the former, since that's much more efficient, but I need to make sure. For example:

Code:

switch (random.Next(0, 2))
{
     case 0:
          foo();
          break;
     case 1:
          foo_2();
          break;
}

Would this code test each case against a different random number, or would it store the random number and then test it against each case? Either way it's a simple fix; if it's the former, I can just do:

Code:

int randomNumber = random.Next(0, 2);

switch (randomNumber)
{
     // stuff
}

The better code depends on when the switch statement and how the switch statement checks the cases. That's my question.

Thanks in advance

Nevermind that, found it out experimentally. It's like I thought; the condition is saved and remains a constant when being compared to the cases. So, a condition that returns a different value each time (e.g. random.Next(MIN, MAX)) can safely be checked against each case.

when all else fails, use the debugger to look at the values at run time.