C# yield example

private void Form1_Load(object sender, EventArgs e)
{
    int i = 0;
    string[] arr = new string[] { "bob1", "can", "bob2", "boB3", "everyday", "Bob4" };

    foreach (string str in FindBobs(arr))
    {
        Console.WriteLine(++i + ". "  + str);
    }
}
static IEnumerable<string> FindBobs(string[] arr)
{
    foreach (string str in arr)
    {
        if (str.Equals("bob3", StringComparison.OrdinalIgnoreCase))
            yield break;
        if (str.StartsWith("bob", StringComparison.OrdinalIgnoreCase))
            yield return str;
    }
}

Output:
1. bob1
2. bob2

If the "yeild break" statement is commented the output is:
1. bob1
2. bob2
3. boB3
4. Bob4