using System;
using System.Collections.Generic;
using System.Diagnostics;

class MyPC {
    public Int32 Id { get; set; }
    public Int64 Memory { get; set; }
    public String Name { get; set; }
}
public class MainClass {
    static void Main(string[] args) {
        var processes = new List<MyPC>();
        foreach (var process in Process.GetProcesses()) {
            processes.Add(new MyPC {
                Id = process.Id,
                Name = process.ProcessName, 
                Memory = process.WorkingSet64
            });
        }
    }
}

    

   
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
class Person {
    int _id;
    int _idRole;
    string _lastName;
    string _firstName;

    public int ID {
        get { return _id; }
        set { _id = value; }
    }

    public int IDRole {
        get { return _idRole; }
        set { _idRole = value; }
    }

    public string LastName {
        get { return _lastName; }
        set { _lastName = value; }
    }

    public string FirstName {
        get { return _firstName; }
        set { _firstName = value; }
    }
}
class Program {
    static void Main(string[] args) {
        List<Person> people = new List<Person> {
               new Person { ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
               new Person { ID = 2, IDRole = 2, LastName = "G", FirstName = "T"}
            };

        Func<Person, bool> filter = delegate(Person p) { return p.ID == 1; };
        var query = people
                    .Where(filter)
                    .Select(p => new { p.FirstName, p.LastName });
    }
}

    

   
 

using System.Collections;
using System;

public delegate bool IntFilter(int i);

public class MainClass {
    public static void Main() {
        int[] nums = { 1, 2, 3, 4, 5, 6};
        int[] oddNums = FilterArrayOfInts(nums, IsOdd);
        foreach (int i in oddNums)
            Console.WriteLine(i);
    }
    public static bool IsOdd(int i) {
        return ((i & 1) == 1);
    }
    public static int[] FilterArrayOfInts(int[] ints, IntFilter filter) {
        ArrayList aList = new ArrayList();
        foreach (int i in ints) {
            if (filter(i)) {
                aList.Add(i);
            }
        }
        return ((int[])aList.ToArray(typeof(int)));
    }
}

    

   
 
using System;
using System.Collections;

public delegate bool IntFilter(int i);

public class MainClass {
    public static int[] FilterArrayOfInts(int[] ints, IntFilter filter) {
        ArrayList aList = new ArrayList();
        foreach (int i in ints) {
            if (filter(i)) {
                aList.Add(i);
            }
        }
        return ((int[])aList.ToArray(typeof(int)));
    }
    public static void Main() {

        int[] nums = { 1, 2, 3, 4, 5, 6};

        int[] oddNums = FilterArrayOfInts(nums, delegate(int i) { return ((i & 1) == 1); });

        foreach (int i in oddNums)
            Console.WriteLine(i);
    }
}

    

   
 
using System;
using System.Collections;

public delegate bool IntFilter(int i);

public class MainClass {
    public static int[] FilterArrayOfInts(int[] ints, IntFilter filter) {
        ArrayList aList = new ArrayList();
        foreach (int i in ints) {
            if (filter(i)) {
                aList.Add(i);
            }
        }
        return ((int[])aList.ToArray(typeof(int)));
    }
    public static void Main() {
        int[] nums = { 1, 2, 3, 4, 5};
        int[] oddNums = FilterArrayOfInts(nums, i => ((i & 1) == 1));
        foreach (int i in oddNums)
            Console.WriteLine(i);
    }
}

    

   
 
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.First();
       Console.WriteLine("The first element in the sequence");
       Console.Write(query);
       query = numbers.Last();
       Console.WriteLine("The last element in the sequence");
       Console.Write(query);
       Console.WriteLine("The first even element in the sequence");
       query = numbers.First(n => n % 2 == 0);
       Console.Write(query);
       Console.WriteLine("The last even element in the sequence");
       query = numbers.Last(n => n % 2 == 0);
       Console.Write(query);
   }
}

    

   
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
public static class Extensions {
    public static string SpaceToUnderscore(this string source) {
        char[] cArray = source.ToCharArray();
        string result = null;

        foreach (char c in cArray) {
            if (Char.IsWhiteSpace(c))
                result += "_";
            else
                result += c;
        }

        return result;
    }
}
class Program {
    static void Main(string[] args) {
        string s = "This is a test";
        Console.WriteLine(s.SpaceToUnderscore());
    }
}