Filtering

using System;  
using System.Collections;  
using System.Collections.Generic;  
using System.Linq;  
  
namespace LinqProject  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            var result = GetCourselist().Where((c, i) =>  
             {  
  
                 if (i % 2 == 0)  
                     return true;  
  
                 return false;  
             }            );  
            foreach (var item in result)  
            {                Console.WriteLine(item.Name);  
            }  
            // IList list = new ArrayList();  
            // list.Add(100);            // list.Add("Bugeto.net");            // list.Add("babaei");            // list.Add("nader");            // list.Add(5);            // list.Add(new Course { Id = 1, Name = "test ", Price = 0 });            //            // var intResult = list.OfType<int>();            // var strResult = list.OfType<string>();            //            // Console.ReadLine();        }  
  
       //private method to get and access to list of courses  
        private static List<Course> GetCourselist()  
        {            //create list with class of course  
            List<Course> courses = new List<Course>()  
            {  
                //intialize courses with new  
                new Course { Id=1, Name="c-sharp" , Price= 10000},  
                new Course { Id=2, Name="Asp net core" , Price= 20000},  
                new Course { Id=3, Name="html" , Price= 5000},  
                new Course { Id=4, Name="css" , Price= 7000},  
                new Course { Id=5, Name="MongoDb" , Price= 55000},  
                new Course { Id = 6, Name = "Android", Price = 18000 }  
            };  
            return courses;  
        }    }    public class Course  
    {  
        public int Id { get; set; }  
        public string Name { get; set; }  
        public int Price { get; set; }  
    }}

Copy

 
       static void Main(string[] args)  
        {  // in here the tip is we use true and false to return course name to                result and it is intersting
            var result = GetCourselist().Where((c, i) =>  
             {  
  
                 if (i % 2 == 0)  
                     return true;  
  
                 return false;  
             }
                         );  
         }

LINQ