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==Demonstrate a using alias==

<source lang="csharp">
// Demonstrate a using alias.

using System;

// Create an alias for Counter.CountDown.
using Count = Counter.CountDown;

// Declare a namespace for counters.
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;
}
}
}

public class NSDemo4 {
public static void Main() {
// Here, Count is used as a name for Counter.CountDown.
Count cd1 = new Count(10);
int i;

do {
i = cd1.count();
Console.Write(i + " ");
} while(i > 0);
Console.WriteLine();

Count cd2 = new Count(20);

do {
i = cd2.count();
Console.Write(i + " ");
} while(i > 0);
Console.WriteLine();

cd2.reset(4);
do {
i = cd2.count();
Console.Write(i + " ");
} while(i > 0);
Console.WriteLine();
}
}

</source>

==Using an alias to resolve ambiguity==

<source lang="csharp">
/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// Alias.cs -- demonstrates using an alias to resolve ambiguity
//
// Compile this program with the following command line:
// C:>csc Alias.cs
using System;
using MsgBox = System.Windows.Forms.MessageBox;
using System.Timers;
namespace nsNamespaces
{
public class Alias
{
static Timer timer;
static public void Main ()
{
// Create the timer object.
timer = new Timer (2000);

// This is a one-shot timer. Set auto reset to false
timer.AutoReset = false;

// Assign the event handler method.
timer.Elapsed += new ElapsedEventHandler(ProcessTimerEvent);

// Start the timer.
timer.Start ();

// Wait for the timeout to occur.
MsgBox.Show ("Waiting for timer to expire", "Text");
}
// Timer event handler.
private static void ProcessTimerEvent (Object obj, ElapsedEventArgs e)
{
MsgBox.Show ("The timer has expired. Press \"OK\" " +
" to terminate the program",
"Timer Expired");
timer.Close ();
Environment.Exit (0);
}
}
}

</source>

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