how to generate and print barcode in c# windows application Lesson 3: Monitoring Performance in Visual C#

Print Denso QR Bar Code in Visual C# Lesson 3: Monitoring Performance

Lesson 3: Monitoring Performance
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Lab: Monitoring Application Performance
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In this lab, you create an application, add two PerformanceCounter objects to it, and monitor their values. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder. 1. Open Visual Studio 2005. 2. Select File, New, Project, Visual C#/ Visual Basic .NET, Windows, and then Console Application. 3. Type PerformanceCounterDemo in the Name text box, and press the OK button. 4. Select the Program.cs file in Visual C# or Module1.vb in Visual Basic. 5. Add the following code to the top of the Program.cs file or Module1.vb file:
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' VB Imports System.Diagnostics Imports System.Timers // C# using System.Diagnostics; using System.Timers;
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6. Create the following three private members: a PerformanceCounter object named HeapCounter, a PerformanceCounter object named ExceptionCounter, and a Timer object named DemoTimer. The following code demonstrates this:
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' VB Private HeapCounter As PerformanceCounter Private ExceptionCounter As PerformanceCounter Private DemoTimer As Timer // C# private static PerformanceCounter HeapCounter = null; private static PerformanceCounter ExceptionCounter = null; private static Timer DemoTimer;
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7. In the constructor, instantiate a new instance of DemoTimer and pass in the value 3000 to the overloaded constructor. Doing this will set the Interval property to 3000 milliseconds, or 3 seconds.
' VB DemoTimer = New Timer(3000) // C# DemoTimer = new Timer(3000);
8. Create an EventHandler for the DemoTimer s Elapsed event, and name it OnTick:
' VB Private Sub OnTick(ByVal source As Object, ByVal e As ElapsedEventArgs) End Sub // C# private static void OnTick(object source, ElapsedEventArgs e) { }
9. Go back to the Main method and wire up a handler for the Elapsed event:
' VB AddHandler DemoTimer.Elapsed, AddressOf OnTick // C# DemoTimer.Elapsed += new ElapsedEventHandler(OnTick);
10. Immediately after the previous line of code, set the Enabled property of the DemoTimer object to true:
' VB DemoTimer.Enabled = True // C# DemoTimer.Enabled = true;
11. Instantiate the HeapCounter PerformanceCounter, and set its CategoryName property to .NET CLR Memory and its CounterName property to # Bytes in all Heaps as illustrated in the following code snippet. Afterward, set the InstanceName property to _Global_ :
' VB HeapCounter = New PerformanceCounter(".NET CLR Memory", "# Bytes in all Heaps") HeapCounter.InstanceName = "_Global_" // C# HeapCounter = new PerformanceCounter(".NET CLR Memory", "# Bytes in all Heaps"); HeapCounter.InstanceName = "_Global_";
Lesson 3: Monitoring Performance
12. Follow the same steps to instantiate the ExceptionCounter PerformanceCounter, except set the CounterName property to # of Exceps Thrown
' VB ExceptionCounter = New PerformanceCounter(".NET CLR Exceptions", "# of Exceps Thrown") ExceptionCounter.InstanceName = "_Global_" // C# ExceptionCounter = new PerformanceCounter(".NET CLR Exceptions", "# of Exceps Thrown"); ExceptionCounter.InstanceName = "_Global_";
13. Add the following lines of code immediately afterward. The first line is for display purposes only, and the second will allow the application to continue running:
' VB Console.WriteLine("Press [Enter] to Quit Program") Console.ReadLine() // C# Console.WriteLine("Press [Enter] to Quit Program"); Console.ReadLine();
14. Add code to display the NextValue property of each of the PerformanceCounter objects in the console window in the EventHandler:
' VB Console.WriteLine("# of Bytes in all Heaps : " + HeapCounter.NextValue().ToString()) Console.WriteLine("# of Framework Exceptions Thrown : " + ExceptionCounter.NextValue() .ToString()) // C# Console.WriteLine("# of Bytes in all Heaps : " + HeapCounter.NextValue().ToString()); Console.WriteLine("# of Framework Exceptions Thrown : " + ExceptionCounter.NextValue() .ToString());
15. Compile the application by selecting Build and then choosing Build Solution or by pressing the F5 key.
Lesson Summary
A process is an executing application, with a unique identifier to differentiate it from other processes. Processes are mechanisms that allow applications to run safely isolated from other applications. The two primary classes for directing output from an application are Debug and Trace. The Trace class listener object is enabled by default in .NET applications. Listener objects are the mechanisms by which Debug and Trace output can be
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