using System;

public class Account
{
   private decimal balance; 

   public Account( decimal initialBalance )
   {
      Balance = initialBalance; 
   } 
   public void Credit( decimal amount )
   {
      Balance = Balance + amount; 
   } 
   public decimal Balance
   {
      get
      {
         return balance;
      } 
      set
      {
         if ( value >= 0 )
            balance = value;
      }
   } 
} 

public class AccountTest
{
   public static void Main( string[] args )
   {
      Account account1 = new Account( 5.00M ); 
      Account account2 = new Account( -7.53M ); 

      Console.WriteLine( "account1 balance: {0:C}",account1.Balance ); 
      Console.WriteLine( "account2 balance: {0:C}
",account2.Balance );

      decimal depositAmount; 

      Console.Write( "Enter deposit amount for account1: " );
      depositAmount = Convert.ToDecimal( Console.ReadLine() );
      Console.WriteLine( "adding {0:C} to account1 balance
",depositAmount );
      account1.Credit( depositAmount ); 

      Console.WriteLine( "account1 balance: {0:C}",account1.Balance );
      Console.WriteLine( "account2 balance: {0:C}
",account2.Balance );

      Console.Write( "Enter deposit amount for account2: " );
      depositAmount = Convert.ToDecimal( Console.ReadLine() );
      Console.WriteLine( "adding {0:C} to account2 balance
",depositAmount );
      account2.Credit( depositAmount ); 

      Console.WriteLine( "account1 balance: {0:C}", account1.Balance );
      Console.WriteLine( "account2 balance: {0:C}", account2.Balance );
   }
}


          

   



using System;

public class MyClass
{
   private string courseName;

   public MyClass( string name )
   {
      CourseName = name; 
   }
   public string CourseName
   {
      get
      {
         return courseName;
      } 
      set
      {
         courseName = value;
      }
   }

   public void DisplayMessage()
   {
      Console.WriteLine( CourseName );
   } 
} 
public class MyClassTest
{
   public static void Main( string[] args )
   {
      MyClass gradeBook1 = new MyClass("C#" );
      MyClass gradeBook2 = new MyClass("Data Structures" );

      Console.WriteLine( "gradeBook1 course name is: {0}",gradeBook1.CourseName );
      Console.WriteLine( "gradeBook2 course name is: {0}",gradeBook2.CourseName );
   }
} 


           
          

   


       

using System;

public class MyClass
{
   public void DisplayMessage( string courseName )
   {
      Console.WriteLine( "Welcome to the grade book for
{0}!",courseName );
   }
}
public class MyClassTest
{
   public static void Main( string[] args )
   {
      MyClass myMyClass = new MyClass();
      Console.WriteLine( "Please enter the course name:" );
      string nameOfCourse = Console.ReadLine(); 
      Console.WriteLine(); 
      myMyClass.DisplayMessage( nameOfCourse );
   } 
}
    
          

   



using System;

public class MyClass
{
   public void DisplayMessage()
   {
      Console.WriteLine( "Welcome to the Grade Book!" );
   }
} 

public class MyClassTest
{
   public static void Main( string[] args )
   {
      MyClass myMyClass = new MyClass();
      myMyClass.DisplayMessage();
   }
}

           
          

   


/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress  L.P.
ISBN: 1-893115-62-3
*/
// 18 - PropertiesVirtual Properties
// copyright 2000 Eric Gunnerson
using System;

public abstract class DrawingObject
{
    public abstract string Name
    {
        get;
    }
}
class Circle: DrawingObject
{
    string name = "Circle";
    
    public override string Name
    {
        get
        {
            return(name);
        }
    }
}

public class PropertiesVirtualProperties
{
    public static void Main()
    {
        DrawingObject d = new Circle();
        Console.WriteLine("Name: {0}", d.Name);
    }
}

           
          

   


/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress  L.P.
ISBN: 1-893115-62-3
*/
// 18 - PropertiesStatic Properties
// copyright 2000 Eric Gunnerson
class Color
{
    public Color(int red, int green, int blue)
    {
        this.red = red;
        this.green = green;
        this.blue = blue;
    }
    
    int    red;
    int    green;
    int    blue;
    
    public static Color Red
    {
        get
        {
            return(new Color(255, 0, 0));
        }
    }
    public static Color Green
    {
        get
        {
            return(new Color(0, 255, 0));
        }
    }
    public static Color Blue
    {
        get
        {
            return(new Color(0, 0, 255));
        }
    }
}

public class StaticProperties
{
    static void Main()
    {
        Color background = Color.Red;
    }
}

           
          

/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress L.P.
ISBN: 1-893115-62-3
*/

// 22 – DelegatesDelegates as Static Properties
// copyright 2000 Eric Gunnerson
using System;
class Container
{
public delegate int CompareItemsCallback(object obj1, object obj2);
public void SortItems(CompareItemsCallback compare)
{
// not a real sort, just shows what the
// inner loop code might do
int x = 0;
int y = 1;
object item1 = arr[x];
object item2 = arr[y];
int order = compare(item1, item2);
}
object[] arr; // items in the collection
}
class Employee
{
Employee(string name, int id)
{
this.name = name;
this.id = id;
}
public static Container.CompareItemsCallback SortByName
{
get
{
return(new Container.CompareItemsCallback(CompareName));
}
}
public static Container.CompareItemsCallback SortById
{
get
{
return(new Container.CompareItemsCallback(CompareId));
}
}
static int CompareName(object obj1, object obj2)
{
Employee emp1 = (Employee) obj1;
Employee emp2 = (Employee) obj2;
return(String.Compare(emp1.name, emp2.name));
}
static int CompareId(object obj1, object obj2)
{
Employee emp1 = (Employee) obj1;
Employee emp2 = (Employee) obj2;

if (emp1.id > emp2.id)
return(1);
if (emp1.id < emp2.id) return(-1); else return(0); } string name; int id; } public class DelegatesasStaticProperties { public static void Main() { Container employees = new Container(); // create and add some employees here employees.SortItems(Employee.SortByName); // employees is now sorted by name } } [/csharp]