/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// Using.cs — Demonstrates using as a statement
//
// Compile this program with the following command line:
// C:>csc Using.cs
using System;
using System.Windows.Forms;
using System.Drawing;
using Pen = System.Drawing.Pen;
using PaintHandler = System.Windows.Forms.PaintEventHandler;

namespace nsForm
{
public class UsingForm : Form
{
public UsingForm ()
{
this.Text = “Using Statement”;
this.Paint += new PaintHandler(this.OnPaint);
}
static public void Main ()
{
Application.Run(new UsingForm());
}
private Color [] clr = new Color []
{
Color.Red,
Color.Green,
Color.Blue
};

private void OnPaint (object obj, PaintEventArgs e)
{
Rectangle client = this.ClientRectangle;
int side = (client.Right – client.Left) / 3;
for (int x = 0; x < 3; ++x) { using (Pen pen = new Pen(clr[x], (float) 2.0)) { client = Rectangle.Inflate (client, -10, -10); e.Graphics.DrawEllipse (pen, client); } } } } } [/csharp]

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
using System;

namespace nsFirst
{
public class NameSpaceDemo
{
static public void Main ()
{
nsSecond.clsClass cls = new nsSecond.clsClass ();
for (nsNested.WeekDays x = nsNested.WeekDays.Sunday; x < nsNested.WeekDays.DaysInWeek; ++x) cls.ShowDay (x); } } namespace nsNested { public enum WeekDays { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, DaysInWeek }; } } namespace nsSecond { class clsClass { public void ShowDay (nsFirst.nsNested.WeekDays day) { Console.WriteLine (day); } } } [/csharp]

   

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example6_10.cs illustrates how the using
  statement is used to specify namespaces
*/

using Sybex;
using System;


public class Example6_10
{

  public static void Main()
  {

    // the Console.WriteLine() call uses the System namespace
    Console.WriteLine("Creating a Sybex.Car object");

    // create a Car object (uses the Sybex namespace)
    Car myCar = new Car();

    myCar.make = "Toyota";
    Console.WriteLine("myCar.make = " + myCar.make);

  }

}

namespace Sybex
{

  // declare the Car class
  public class Car
  {
    public string make;
  }

}



           
          

   

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/
/*
  Example6_8.cs illustrates the use of namespace
  hierarchies (part 1)
*/


public class Example6_8
{

  public static void Main()
  {

    Sybex.UserInterface.MyClass myUI = new Sybex.UserInterface.MyClass();
    Sybex.DatabaseAccess.MyClass myDB = new Sybex.DatabaseAccess.MyClass();

    // uses class in MiddleTier namespace in Example6_9
    Sybex.MiddleTier.MyClass myMT = new Sybex.MiddleTier.MyClass();

    // call the Test() methods
    myUI.Test();
    myDB.Test();
    myMT.Test();

  }

}
namespace Sybex
{
  namespace UserInterface  // nested namespace
  {
    public class MyClass
    {
      public void Test()
      {
        System.Console.WriteLine("UserInterface Test()");
      }
    }
  }
}


namespace Sybex.DatabaseAccess  // nested namespace using dot
{
  public class MyClass
  {
    public void Test()
    {
      System.Console.WriteLine("DatabaseAccess Test()");
    }
  }
}
/*
  Example6_9.cs illustrates the use of namespace
  hierarchies (part 2)
*/


namespace Sybex  // use the Sybex namespace
{
  namespace MiddleTier  // another namespace
  {
    public class MyClass {
      public void Test() {
        System.Console.WriteLine("MiddleTier Test()");
      }
    }
  }
}





           
          

   

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example6_7.cs illustrates the use of two namespaces
*/


public class Example6_7
{

  public static void Main()
  {

    // create a Sybex.Car object
    System.Console.WriteLine("Creating a Sybex.Car object");
    Sybex.Car myCar = new Sybex.Car();
    myCar.make = "Toyota";
    System.Console.WriteLine("myCar.make = " + myCar.make);

    // create a DifferentCompany.Car object
    System.Console.WriteLine("Creating a DifferentCompany.Car object");
    DifferentCompany.Car myOtherCar = new DifferentCompany.Car();
    myOtherCar.make = "Porsche";
    System.Console.WriteLine("myOtherCar.make = " + myOtherCar.make);

  }

}
// create the Sybex namespace
namespace Sybex
{

  // declare the Car class
  public class Car
  {
    public string make;
  }

}


// create the DifferentCompany namespace
namespace DifferentCompany
{

  // declare the Car class
  public class Car
  {
    public string make;
  }

}



           
          

   

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Namespaces can be nested. 
 
using System; 
 
namespace NS1 { 
  class ClassA { 
     public ClassA() { 
       Console.WriteLine("constructing ClassA"); 
    } 
  } 
  namespace NS2 { // a nested namespace 
    class ClassB { 
       public ClassB() { 
         Console.WriteLine("constructing ClassB"); 
      } 
    } 
  } 
} 
 
public class NestedNSDemo { 
  public static void Main() { 
    NS1.ClassA a= new NS1.ClassA(); 
 
 // NS2.ClassB b = new NS2.ClassB(); // Error!!! NS2 is not in view 
 
    NS1.NS2.ClassB b = new NS1.NS2.ClassB(); // this is right 
  } 
}

           
          

/*
C#: The Complete Reference
by Herbert Schildt

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Namespaces are additive.

using System;

// Bring Counter into view.
using Counter;

// Here is one Counter namespace.
namespace Counter {
// A simple countdown counter.
class CountDown {
int val;

public CountDown(int n) {
val = n;
}

public void reset(int n) {
val = n;
}

public int count() {
if(val > 0) return val–;
else return 0;
}
}
}

// Here is another Counter namespace.
namespace Counter {
// A simple count-up counter.
class CountUp {
int val;
int target;

public int Target {
get{
return target;
}
}

public CountUp(int n) {
target = n;
val = 0;
}

public void reset(int n) {
target = n;
val = 0;
}

public int count() {
if(val < target) return val++; else return target; } } } public class NSDemo5 { public static void Main() { CountDown cd = new CountDown(10); CountUp cu = new CountUp(8); int i; do { i = cd.count(); Console.Write(i + " "); } while(i > 0);
Console.WriteLine();

do {
i = cu.count();
Console.Write(i + ” “);
} while(i < cu.Target); } } [/csharp]