using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

    //Check if any duplicate in a List

    List<int> abc=new List<int>();

    bool result=abc.GroupBy(n => n).Any(c=>c.Count()>1);

    //Check if all are unique

    result = abc.GroupBy(n => n).All(c =>c.Count() == 1);

    //For syntax

    decimal j=50.1M;

    for (int i=0; i<10 || j>10;  i++,j=j-2)

    {Console.WriteLine("i="+i.ToString()+" and j=" +j.ToString());}

​

    }

}