SelectionSort.cs

private static int[] SelectionSort(int[] value)
{
    if (value != null && value.Length > 1)
    {
        for (var targetIndex = 0; targetIndex < value.Length - 1; ++targetIndex)
        {
            var minIndex = targetIndex;
            for (var index = targetIndex + 1; index < value.Length; ++index)
            {
                if (value[index] < value[minIndex])
                {
                    minIndex = index;
                }
            }
            if (minIndex != targetIndex) // if we found a minimum in the rest of the array, swap
            {
                var tmp = value[minIndex];
                value[minIndex] = value[targetIndex];
                value[targetIndex] = tmp;
            }
        }
    }

    return value;
}