sortowania przez wstawienie, 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.WriteLine("Hello, world!");
            
            
            int [] a = new int [] {3,1,2,7,4,9};
           
            
            for ( int i = 1; i < a.Length ; i++ )
            {
                int x = a[i]; // 1
                
                 while ( x < a[i-1] )
                {
                    int j = a[i-1];
                      a[i]= a[i-1];
                      a[i-1] = x;
                   
                 }
            }
            
            /*   for ( int i = 0; i < a.Length ; i++)
               {
                  for ( int k = i+1 ; k < a.Length; k++) 
                  {
                 
                     int min = a[i]; 
                   
                   if ( a[k] < a[i] )
                       
                   {
                       min = a[k]; 
                       a[k] = a[i]; 
                       a [i] = min; 
                   }
                 
                   }
                      
               }*/
                    
              
        
            
                   foreach(var item in a)
                    {
                      Console.WriteLine(item.ToString());
                   }
                 
            
           }
      }
    
        
 }

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 0,28 sec