c# console not compiling - Urgent Please help

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SinglyLinkedListExersize
{
    /* 
 * Write a function that would return the 5th element from the 
 * tail (or end) of a singly linked list of integers, in one pass, 
 * and then provide a set of test cases against that function 
 * (please do not use any list manipulation functions that you 
 * do not implement yourself). 
 */
    class App
    {

        public static void main(String[] args) { 
int arr[] = new int[] { 0, 1, 2, 3, 4, 5, 6 }; 

int lastLocation = 0; 

while (true) { 
try { 
System.out.println(arr[lastLocation]); 

lastLocation = lastLocation + 5; 
} catch (ArrayIndexOutOfBoundsException e) { 
//System.out.println("arr Out of index: " + lastLocation); 
break; 
} 
} 

lastLocation--; 

for (int i = 0; i < 5; i++) { 
try { 
// This sysout statement ensure that same element is not hit 
// twice 
System.out.println(arr[lastLocation]); 
if(lastLocation < 4) { 
System.out.println("Array Length less than 5"); 
break; 
} 

//	 System.out.println("Last element of array: " 
//	 + arr[lastLocation]); 
System.out.println("5th Last element of array: " 
+ arr[lastLocation - 4]); 
break; 
} catch (ArrayIndexOutOfBoundsException e) { 
System.out.println(lastLocation--); 
} 
} 
}
}
}

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