Printing a matrix like a snake

Question

I am to print a matrix in C# like a snake, something like this. Any advice on how to proceed?

1 2 3 4 5 6 
          6
1 2 3 4   6
1     4   6
1     4   6
1     4   6 
1   3 4   6
1         6
1 2 3 4 5 6

Here is the code I have so far. Basically i need to figure out how to skip rows and columns.

Console.WriteLine("Enter your number: ");
        int n = Convert.ToInt32(Console.ReadLine());
        int[,] a = new int[n, n];
        int printVal = 1;
        int c1 = 0, c2 = n - 1;
        while(printVal <= n * n)
        {
            //dvizenje na desno
            for (int i = c1; i <= c2; i++)
                a[c1, i] = printVal++;

            //dvizenje nadolu
            for (int j = c1 + 1; j <= c2; j++)
                a[j, c2] = printVal++;

            // dvizenje na levo
            for (int i = c2 - 1; i >= c1; i--)
                a[c2, i] = printVal++;

            //dvizenje nagore
            for (int j = c2 - 1; j >= c1 + 1; j--)
                a[j, c1] = printVal++;
            c1++;
            c2--;
        }
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < n; j++)
            {
                Console.Write(a[i, j] + "\t");
            }
            Console.WriteLine();
        }

Answer 1

Something like that, it's not finished and can be more effective but it's the idea (Builder Design Pattern)

public class NumberElement
{
    private StringBuilder sb;

    public NumberElement()
    {
        sb = new StringBuilder();
    }

    public void AddNumbers(int Numbers)
    {
        for(int i = 1; i < Numbers + 1; i++)
        {
            AddNumber(i);
        }
    }

    public void AddSpaces(int SpaceNumber)
    {
        for (int i = 1; i < SpaceNumber + 1; i++)
        {
            AddSpace();
        }
    }
    public void AddNumber(int number)
    {
            sb.Append(number + " ");
    }
    public void AddSpace()
    {
            sb.Append("  ");
    }

    public void AddNewLine()
    {
        sb.Append("\n");
    }

    public override string ToString()
    {

        return sb.ToString();
    }
}

class Program
{
    static public void Example(NumberElement ne)
    {
        //Line 1
        ne.AddNumbers(6);
        ne.AddNewLine();
        //Line 2
        ne.AddSpaces(5);
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 3
        ne.AddNumbers(4);
        ne.AddSpace();
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 4
        ne.AddNumber(1);
        ne.AddSpaces(2);
        ne.AddNumber(4);
        ne.AddSpace();
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 5
        ne.AddNumber(1);
        ne.AddSpaces(2);
        ne.AddNumber(4);
        ne.AddSpace();
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 6
        ne.AddNumber(1);
        ne.AddSpaces(2);
        ne.AddNumber(4);
        ne.AddSpace();
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 6
        ne.AddNumber(1);
        ne.AddSpace();
        ne.AddNumber(3);
        ne.AddNumber(4);
        ne.AddSpace();
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 7
        ne.AddNumber(1);
        ne.AddSpaces(4);
        ne.AddNumber(6);
        ne.AddNewLine();
        //Line 8
        ne.AddNumbers(6);
    }

    static void Main(string[] args)
    {
        NumberElement ne = new NumberElement();
        Example(ne);
        Console.WriteLine(ne);
    }
}