using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        string[] presidents = {"Ad", "Art", "Buch", "Bush", "Car", "land"};

        IEnumerable<char> chars = presidents.SelectMany(p => p.ToArray());

        foreach (char ch in chars)
            Console.WriteLine(ch);

    }
}

    

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {“A”, “Art”, “Buch”, “Bush”, “Carter”, “land”};

IEnumerable chars = presidents
.SelectMany((p, i) => i < 5 ? p.ToArray() : new char[] { }); foreach (char ch in chars) Console.WriteLine(ch); } } [/csharp]

   
 

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

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};

        bool eq = presidents.SequenceEqual(presidents);
        Console.WriteLine(eq);

    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        string[] strings = { "one", "two", null, "three" };

        Console.WriteLine("Before Where() is called.");
        IEnumerable<string> ieStrings = strings.Where(s => s.Length == 3);
        Console.WriteLine("After Where() is called.");

        foreach (string s in ieStrings) {
            Console.WriteLine("Processing " + s);
        }

    }
}

    

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

public class MainClass {
public static void Main() {

List products = GetProductList();

var productNames =
from p in products
select p.ProductName;

foreach (var productName in productNames) {
Console.WriteLine(productName);
}
}

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 = 1 });
empTree.Add(new Product { ProductName = “C”, Category = “O”, UnitPrice = 112, UnitsInStock = 3, Total = 34, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “D”, Category = “O”, UnitPrice = 112, UnitsInStock = 0, Total = 33, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “E”, Category = “O”, UnitPrice = 1112, UnitsInStock = 2, Total = 32, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “F”, Category = “O”, UnitPrice = 11112, UnitsInStock = 0, Total = 31, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
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;
using System.Linq;
public class MainClass {
    public static void Main() {

        string[] numbers = { "0042", "010", "9", "2q7" };

        int[] nums = numbers.Select(s => Int32.Parse(s)).ToArray();

    }
}

    

   
 

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

        string[] numbers = { "0042", "010", "9", "2q7" };

        int[] nums = numbers.Select(s => Int32.Parse(s)).OrderBy(s => s).ToArray();

        foreach (int num in nums)
            Console.WriteLine(num);
    }
}