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/// <summary>
/// Goes from 1 to 99, lists on Console the number incremented forward and backwards
/// Right adjusting the values. All values except the last number are repeated in reverse order
/// IE if 5 is passed "123454321" is fifth line, 9 lines total listed
/// </summary>
/// <param name="num">The largest middle number</param>
static void stringlist(int num)
{
    if (num < 0) num = -num;
    if (num < 2)
    {
        Console.WriteLine("1");
        return;
    }
    if (num > 99)
    {
        Console.WriteLine("Passed number ({0}) exceeds 99, setting to 99", num);
        num = 99;
    }
    List<string> forward = new List<string>();
    StringBuilder left = new StringBuilder(), right = new StringBuilder(), pad = new StringBuilder();
    int len = 0;
    for (int i = 1; i <= num; i++)
    {
        pad.Append("    ");
        left.Append(i);
        string x = left.ToString() + right.ToString();
        forward.Add(x);
        len = x.Length;
        right.Insert(0, i);
    }
    foreach (string x in forward)
        if (x.Length == len) Console.WriteLine(x);
        else Console.WriteLine("{0}{1}", pad.ToString(0, len - x.Length), x);
    for (int i = forward.Count - 2; i > -1; i--)//-2 points to the next to last number
        Console.WriteLine("{0}{1}", pad.ToString(0, len - forward[i].Length), forward[i]);
}

KP Lee wrote:

So, how would you grade my coding?