選中和取消選中作為範圍

關鍵字還可以建立範圍以便（取消）檢查多個操作。

short m = 32767;
short n = 32767;
checked
{
    int result1 = (short)(m + n); //will throw an OverflowException
}
unchecked
{
    int result2 = (short)(m + n); // will return -2
}