So why do I always see sample code of an integer addition method written in C# like this:

private static int add(int a, int b){
    return a + b;
}

So if I were to add 2,000,000,000 and 2,000,000,000 – an integer datatype would overflow. But the solution isn’t merely to set the return value to a “long” (i.e. 64-bit integer):

private static long add(int a, int b){
    return a + b;
}

You have to cast each parameter variable to a long before performing the addition:

private static long add(int a, int b){
    return (long)a + (long)b;
}

Here are some I found:

http://www.cs.tufts.edu/comp/194NET/notes/csharp.php3

http://www.harding.edu/fmccown/java1_5_csharp_comparison.html

http://www.developernotes.com/post/Use-Ruby-to-Unit-Test-C.aspx

a