Implementation Of Linked Lists Using Collections Name Space In C#

using System;
using System.Collections.Generic;
namespace LinkList {
class Program {
static LinkedList < int > ll = new LinkedList < int > ();
static LinkedListNode < int > node;
static void Main(string[] args) {
Console.WriteLine(" LINKED LIST DEMO");
int ch, x;
Console.WriteLine("Linked List Operations");
Console.WriteLine("1.AddFirst\n2.AddLast\n3.RemoveFirst\n4.RemoveLast\n5.Remove Specified\n6.Display\n7..Exit");
while (true) {
Console.Write("Enter your Choice : ");
ch = Convert.ToInt16(Console.ReadLine());
switch (ch) {
case 1:
Console.Write("Enter the Element to AddFirst : ");
x = Convert.ToInt16(Console.ReadLine());
ll.AddFirst(x);
display();
break;
case 2:
Console.WriteLine("Enter the Element to AddLast : ");
x = Convert.ToInt16(Console.ReadLine());
ll.AddLast(x);
display();
break;
case 3:
if (ll.Count == 0) {
Console.WriteLine("Nothing to Delete...!!!");
break;
} else {
Console.WriteLine("First Element Removed Successfully");
ll.RemoveFirst();
display();
break;
}
case 4:
if (ll.Count == 0) {
Console.WriteLine("Nothing to Delete...!!!");
break;
} else {
Console.WriteLine("Last Element Removed Successfully");
ll.RemoveLast();
display();
break;
}
case 5:
if (ll.Count == 0) {
Console.WriteLine("Nothing to Delete...!!!");
break;
} else {
Console.WriteLine("Enter the Element to Remove");
x = Convert.ToInt16(Console.ReadLine());
bool b = ll.Remove(x);
if (b == true) {
Console.WriteLine("Element Removed Successfully");
display();
break;
} else {
Console.WriteLine("Specified Node Does not Exist");
break;
}
}
case 6:
display();
break;
default:
Environment.Exit(0);
break;
}
}
}
public static void display() {
if (ll.Count == 0) {
Console.WriteLine("Nothing to Display...!!!");
} else {
Console.Write("Elements in the List are:");
for (node = ll.First; node != null; node = node.Next) Console.Write(node.Value + " ");
Console.WriteLine();
}
}
}
}