Merger two sorted arrays.

Merge.cs

/// <summary>
/// Merge two sorted arrays.
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static IEnumerable<int> Merge(int[] a, int[] b)
{
    int i = 0;
    int j = 0;

    while (i < a.Length || j < b.Length)
    {
        if (j == b.Length || a[i] < b[j])
        {
            yield return a[i];
            i++;
        }
        else if (i == a.Length || a[i] > b[j])
        {
            yield return b[j];
            j++;
        }
        else
        {
            yield return a[i];
            yield return b[j];
            i++;
            j++;
        }
    }
}