string[] states = { "Bengal","Daman and Diu","Goa","Haryana","Kashmir","Kerala","Laccadives","NCT" ,"Rajasthan","Andhra Pradesh" ,"Arunāchal Pradesh","Assam","Bihār","Chhattīsgarh" ,"Gujarāt","Himāchal Pradesh","Jharkhand","Karnātaka","Madhya Pradesh","Mahārāshtra" ,"Manipur","Meghālaya","Mizoram","Nāgāland","Odisha","Punjab","Sikkim","Tamil Nādu" ,"Tripura","Andaman and Nicobar Islands","Chandīgarh","Dādra and Nagar Haveli" ,"Puducherry","Uttar Pradesh","Uttarakhand" }; //public static IEnumerable<T> Where<T>( this IEnumerable<T> source, Func<T, bool> predicate); IEnumerable<string> sequence = states.Where(p => p.StartsWith("J")); foreach (string s in sequence) Console.WriteLine("{0}", s); //public static IEnumerable<T> Where<T>( this IEnumerable<T> source, Func<T, int, bool> predicate); IEnumerable<string> sequence2 = states.Where((p, i) => (p.StartsWith("J")) &&((i & 1) == 1)); foreach (string s in sequence2) Console.WriteLine("{0}", s);