using System;
using System.Collections.Generic;
using System.Linq;
public class MainClass {
    public static void Main() {

        int[] numbers = { 10, 9, 8, 7, 6 };
        IEnumerable<int> firstThree = numbers.Take(3);     // { 10, 9, 8 }

    }
}

    

   
 

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class MainClass{
   public static void Main(){
       int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
       var query = numbers.Take(5);

       var query2 = numbers.Skip(5);
    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        string[] presidents = {"A", "A", "B", "Bu", "Car", "land"};

        IEnumerable<string> items = presidents.Take(5);

        foreach (string item in items)
            Console.WriteLine(item);
    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
    public int id;
    public string firstName;
    public string lastName;

    public static ArrayList GetEmployeesArrayList() {
        ArrayList al = new ArrayList();
        al.Add(new Employee { id = 1, firstName = "J", lastName = "R" });
        al.Add(new Employee { id = 2, firstName = "W", lastName = "G" });
        al.Add(new Employee { id = 3, firstName = "A", lastName = "H" });
        al.Add(new Employee { id = 4, firstName = "D", lastName = "L" });
        al.Add(new Employee { id = 101, firstName = "K", lastName = "F" });
        return (al);
    }

    public static Employee[] GetEmployeesArray() {
        return ((Employee[])GetEmployeesArrayList().ToArray(typeof(Employee)));
    }
}
public class EmployeeOptionEntry {
    public int id;
    public long optionsCount;
    public DateTime dateAwarded;

    public static EmployeeOptionEntry[] GetEmployeeOptionEntries() {
        EmployeeOptionEntry[] empOptions = new EmployeeOptionEntry[] {
        new EmployeeOptionEntry { 
          id = 1, 
          optionsCount = 2, 
          dateAwarded = DateTime.Parse("1999/12/31") },
        new EmployeeOptionEntry { 
          id = 101, 
          optionsCount = 2, 
          dateAwarded = DateTime.Parse("1998/12/31") }
      };
        return (empOptions);
    }
}
public class MainClass {
    public static void Main() {
        IEnumerable<EmployeeOptionEntry> options = EmployeeOptionEntry.GetEmployeeOptionEntries();
        long optionsSum = options.Sum(o => o.optionsCount);
        Console.WriteLine("The sum of the employee options is: {0}", optionsSum);
    }
}

    

   
 


using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Reflection;

public class MainClass{
   public static void Main(){
            int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            var query = numbers.Sum();
   }
}

    

   
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

        double numSum = numbers.Sum();

        Console.WriteLine("The sum of the numbers is {0}.", numSum);
    }
}

    

   
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        string[] words = { "cherry", "apple", "blueberry" };

        double totalChars = words.Sum(w => w.Length);

        Console.WriteLine("There are a total of {0} characters in these words.", totalChars);
    }
}