Question

Possible Duplicate:
Comparing Arrays in C#

I have a two string arrays:

string[] a;
string[] b;

How can I identify how many (and what) items of a are not present in b? As I am using .NET 2.0 so I can’t use linq.

Answer 1

Just enumerate items in both a and b, just like in the old days:

private static void Main(string[] args)
{
    string[] a = new string[] { "a", "b", "c", "d" };
    string[] b = new string[] { "c", "d" };

    foreach (string tmp in a)
    {
        bool existsInB = false;
        foreach (string tmp2 in b)
        {
            if (tmp == tmp2)
            {
                existsInB = true;
                break;
            }
        }

        if (!existsInB)
        {
            Console.WriteLine(string.Format("{0} is not in b", tmp));
        }
    }

    Console.ReadLine();
}