Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability.
using System; using System.Linq; using System.Collections.Generic; class LinqExercise { static void Main(string[] args) { string str; Console.Write("Input the string : "); str = Console.ReadLine(); var ucWord = WordFilt(str); Console.Write("\nThe upper case words are :\n "); foreach (string strRet in ucWord) { Console.WriteLine(strRet); } Console.ReadLine(); } static IEnumerable<string> WordFilt(string mystr) { var upWord = mystr.Split(' ') .Where(x => String.Equals(x, x.ToUpper(), StringComparison.Ordinal)); return upWord; } }