using System;
delegate int NumericSequence();

class Test {
    static NumericSequence Natural() {
        return () => { int seed = 0; return seed++; };
    }

    static void Main() {
        NumericSequence natural = Natural();
        Console.WriteLine(natural());
        Console.WriteLine(natural());
    }
}

    

   
 
using System;
delegate int NumericSequence();

class Test {
    static NumericSequence Natural() {
        int seed = 0;
        return () => seed++;

    }

    static void Main() {
        NumericSequence natural = Natural();
        Console.WriteLine(natural());
        Console.WriteLine(natural());
    }
}

    

using System;
using System.Linq;
using System.Linq.Expressions;

class Program {
static void Main(string[] args) {
Expression> isOddExpression = i => (i & 1) == 1;
ParameterExpression param = Expression.Parameter(typeof(int), “i”);
Expression> isOdd =
Expression.Lambda>(
Expression.Equal(
Expression.And(
param,
Expression.Constant(1, typeof(int))),
Expression.Constant(1, typeof(int))),
new ParameterExpression[] { param });

Func isOddCompiledExpression = isOddExpression.Compile();
for (int i = 0; i < 10; i++) { if (isOddCompiledExpression(i)) Console.WriteLine(i + " is odd"); else Console.WriteLine(i + " is even"); } } } [/csharp]

   
 

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

        int[] numbers = { 1, 2 };

        int factor = 10;
        IEnumerable<int> query = numbers.Select(n => n * factor);

        factor = 20;
        foreach (int n in query) Console.Write(n + "|");   
    }
}

    

using System;
using System.Linq;
using System.Linq.Expressions;

class Program {
static void Main(string[] args) {
Func isOddDelegate = i => (i & 1) == 1;
for (int i = 0; i < 10; i++) { if (isOddDelegate(i)) Console.WriteLine(i + " is odd"); else Console.WriteLine(i + " is even"); } } } [/csharp]

   
 

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());
    }
}
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() {
        Employee[] employees = Employee.GetEmployeesArray();
        EmployeeOptionEntry[] empOptions = EmployeeOptionEntry.GetEmployeeOptionEntries();
        var employeeOptions = employees
          .Join(
            empOptions,      
            e => e.id,       
            o => o.id,       
            (e, o) => new    
                      {
                          id = e.id,
                          name = string.Format("{0} {1}", e.firstName, e.lastName),
                          options = o.optionsCount
                      });

        foreach (var item in employeeOptions)
            Console.WriteLine(item);

    }
}

    

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

class Salary {
    int _id;
    int _year;
    double _salary;

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

    public int Year {
        get { return _year; }
        set { _year = value; }
    }

    public double SalaryPaid {
        get { return _salary; }
        set { _salary = value; }
    }
}
class Employee {
    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 Role {
    int _id;
    string role;

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

    public string Role {
        get { return role; }
        set { role = value; }
    }
}

public class MainClass {
    public static void Main() {
        List<Employee> people = new List<Employee> {
              new Employee  { ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
              new Employee  { ID = 2, IDRole = 2, LastName = "G", FirstName = "T"},
              new Employee  { ID = 3, IDRole = 2, LastName = "G", FirstName = "M"},
              new Employee  { ID = 4, IDRole = 3, LastName = "C", FirstName = "G"}
            };
        List<Role> roles = new List<Role> {
               new Role { ID = 1, Role = "Manager" },
               new Role { ID = 2, Role = "Developer" }
            };

        List<Salary> salaries = new List<Salary> {
               new Salary { ID = 1, Year = 2004, SalaryPaid = 10000.00 },
               new Salary { ID = 1, Year = 2005, SalaryPaid = 15000.00 },
               new Salary { ID = 1, Year = 2005, SalaryPaid = 15000.00 }
            };
        var query = from p in people
                    join s in salaries on p.ID equals s.ID
                    where p.ID == 1
                    select s.SalaryPaid;

        Console.Write(query.Min());
        Console.Write(query.Max());
    }
}