What is the difference between checked and unchecked?

Question

What is the difference between

checked(a + b)

and

unchecked(a + b)

?

Answer 1

The other answers cover the difference between the two. One thing worth noting is that if a and b are floats there will be no difference. It only works for integer operations.

There is also a build option you can set so everything is checked. This will mean your app runs slightly slower but you won't need to put checked around your arithmetic operations.

Here is a nice writeup that describes some pitfalls: http://www.codeproject.com/KB/cs/overflow_checking.aspx