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

public class MainClass {
public static void Main() {

List products = GetProductList();
Product product12 = (
from p in products
where p.Id == 2
select p)
.First();

Console.Write(product12.Category);
}
static List GetProductList() {
List empTree = new List();
empTree.Add(new Product { ProductName = “A”, Category = “O”, UnitPrice = 12, UnitsInStock = 5, Total = 36, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “B”, Category = “O”, UnitPrice = 2, UnitsInStock = 4, Total = 35, OrderDate = new DateTime(2005, 1, 1), Id = 2 });
empTree.Add(new Product { ProductName = “C”, Category = “O”, UnitPrice = 112, UnitsInStock = 3, Total = 34, OrderDate = new DateTime(2005, 1, 1), Id = 3 });
empTree.Add(new Product { ProductName = “D”, Category = “O”, UnitPrice = 112, UnitsInStock = 0, Total = 33, OrderDate = new DateTime(2005, 1, 1), Id = 4 });
empTree.Add(new Product { ProductName = “E”, Category = “O”, UnitPrice = 1112, UnitsInStock = 2, Total = 32, OrderDate = new DateTime(2005, 1, 1), Id = 5 });
empTree.Add(new Product { ProductName = “F”, Category = “O”, UnitPrice = 11112, UnitsInStock = 0, Total = 31, OrderDate = new DateTime(2005, 1, 1), Id = 6 });
return empTree;
}

}

class Product : IComparable {
public string ProductName { get; set; }
public string Category { get; set; }
public int UnitPrice { get; set; }
public int UnitsInStock { get; set; }
public int Total { get; set; }
public DateTime OrderDate { get; set; }
public int Id { get; set; }

public override string ToString() {
return String.Format(“Id: {0}, Name: {1} , Category: {3}”, this.Id, this.ProductName, this.Category);
}
int IComparable.CompareTo(Product other) {
if (other == null)
return 1;
if (this.Id > other.Id)
return 1;

if (this.Id < other.Id) return -1; return 0; } } [/csharp]

   
 

using System;

class Class1 {
}

class Class2 {
    public void Method1(string s) {
        Console.WriteLine("Class2.Method1");
    }
}

class Class3 {
    public void Method1(object o) {
        Console.WriteLine("Class3.Method1");
    }
}

class Class4 {
    public void Method1(int i) {
        Console.WriteLine("Class4.Method1");
    }
}

static class Extensions {
    static public void Method1(this object o, int i) {
        Console.WriteLine("Extensions.Method1");
    }

    static void Main() {
        new Class1().Method1(12); // Extensions.Method1 is called
        new Class2().Method1(12); // Extensions.Method1 is called
        new Class3().Method1(12); // Class3.Method1 is called
        new Class4().Method1(12); // Class4.Method1 is called
    }
}

    

   
 

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);
    }
}