Left circular rotation of an array, 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
            int [] arr1 = {1,2,3,4,5,6};
            display(arr1, "The array is : ");
            RotateLeftApproach1(arr1);
            display(arr1, "array after left shift :  ");
            
            Console.WriteLine("\n");
            int [] arr2 = { 2, 4, 6, 8 };
            display(arr2, "The array is : ");
            RotateLeftApproach2(arr2);
            display(arr2, "array after left shift :  ");
        }
        
        public static void RotateLeftApproach1(int[] array) {  
             int size = array.Length;  
             int temp;  
             for (int j = size - 1; j > 0; j--) {  
                 //shift last element and array[j-1] element
                 temp = array[size - 1];   
                 array[size - 1] = array[j - 1];  
                 array[j - 1] = temp;  
             }
         }
        
        public static void RotateLeftApproach2(int[] array) {  
             int size = array.Length;  
             int temp;  
             for (int j = 0; j <= size-2; j++) {  
                 //shift last element and array[j-1] element
                 temp = array[j];   
                 array[j] = array[j + 1];  
                 array[j + 1] = temp;  
             }
         }
        public static void display(int [] arr, string msg ){
             Console.Write(msg); 
             foreach (int num in arr) {  
                 Console.Write(num + " ");  
             } 
            Console.WriteLine();
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,28 sec, absolute running time: 0,44 sec, cpu time: 0,45 sec, average memory usage: 18 Mb, average nr of threads: 3, absolute service time: 0,77 sec