Matrix Pattern, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            //Console.Write("Enter your Number:");  
            int n = 4;  
            int[, ] a = new int[n, n];  
            int printValue = 1;  
            int c1 = 0, c2 = n - 1;  
            while (printValue <= n * n)  
            {  
                //Right Direction Move  
                for (int i = c1; i <= c2; i++)  
                    a[c1, i] = printValue++;  
                //Down Direction Move  
                for (int j = c1 + 1; j <= c2; j++)  
                    a[j, c2] = printValue++;  
                //Left Direction Move  
                for (int i = c2 - 1; i >= c1; i--)  
                    a[c2, i] = printValue++;  
                //Up Direction Move  
                for (int j = c2 - 1; j >= c1 + 1; j--)  
                    a[j, c1] = printValue++;  
                c1++;  
                c2--;  
            }  
            for (int i = 0; i < n; i++)  
            {  
                for (int j = 0; j < n; j++)  
                {  
                    Console.Write(a[i, j] + "\t");  
                }  
                Console.WriteLine();  
            }  
            Console.Read(); 
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 10 sec, cpu time: 0,06 sec, average memory usage: 22 Mb, average nr of threads: 5