There is a completely different thread about a slightly tangential topic, but I'm noticing a number of pieces of example code that concerns me.

I've done this myself, but how 'safe' is it:

Console.WriteLine(new String("Bob").Length);

The part that concerns me is the accessing of the function 'Length' when you don't really know that the new String has actually been created.

The other side of the coin, however, is that you could end up with twice as many lines of code if you check every single variable before using it.

What do you do?