qr code generator asp net c# The PerformanceCounter Class in C#

Creator QR Code in C# The PerformanceCounter Class

The PerformanceCounter Class
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Each of the previous items were parts that, when used together, help provide a tremendous amount of information about PerformanceCounter objects. To illustrate what can be done with a PerformanceCounter, I ll present a common scenario: examining how many applications are running on an ASP.NET process. There is a predefined category named ASP.NET and a predefined counter named Applications Running . Assuming that we had a counter with these two properties set, examine the following code:
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' VB Dim Crlf As String = ControlChars.CrLf Dim Builder = New StringBuilder() Builder.Append("Counter Name: " + DemoCounter.CounterName + Crlf)
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Lesson 3: Monitoring Performance
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Builder.Append("Counter Type: " + DemoCounter.CounterType.ToString() + Crlf) Builder.Append("Category Name: " + DemoCounter.CategoryName + Crlf) Builder.Append("Instance Name: " + DemoCounter.InstanceName + Crlf) Builder.Append("Machine Name: " + DemoCounter.MachineName + Crlf") MessageBox.Show(Builder.ToString()) // C# StringBuilder Builder = new StringBuilder(); Builder.Append("Counter Name:" + DemoCounter.CounterName + "\r\n"); Builder.Append("Counter Type:" + DemoCounter.CounterType.ToString() + "\r\n"); Builder.Append("Category Name:" + DemoCounter.CategoryName + "\r\n"); Builder.Append("Instance Name:" + DemoCounter.InstanceName+ "\r\n"); Builder.Append("Machine Name:" + DemoCounter.MachineName + "\r\n"); MessageBox.Show(Builder.ToString());
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When run, this code presents information about this specific PerformanceCounter.
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Starting Processes
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Many times there is a need to start external applications or processes from within your application. For instance, you might want to provide help for a user and start Internet Explorer, passing it a specific URL that provides useful information. There are two ways to start a process:
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Use without command-line arguments. Specify command-line arguments.
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Each approach is described in the following sections.
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Start Processes without Command-Line Arguments
For a simple process, all that s needed to start a process in .NET is to call the Start method of the Process class. The Process class s constructor has five overloads, three of which are for non command-line scenarios.
NOTE Specifying command-line parameters to start a program
The Main method of .NET applications has two overloaded constructors. The first of those takes no parameters. The second of those takes an array of String objects separated by a single space. Each of those values is considered a separate parameter. For example, the literal This is a Test passed into the Main method would evaluate to four different values: This , is , a , and Test .
The first of those five overloads takes one parameter of type ProcessStartInfo. The ProcessStartInfo class has quite a few properties, which afford in-depth control over how a process is started. Because you can start many process types (for example, a console application, a Winforms application, and so on), the properties that are specified for each can differ substantially. For the sake of this discussion, we ll focus on the properties
10
Instrumentation
that correspond to the overloaded constructors. (Refer to the code named ProcessStartDemo in the 11 folder the companion CD.)
NOTE Use of the ProcessStartInfo class
In many instances, you ll want to set many more properties than are provided in the constructors. To accomplish this, the ProcessStartInfo class must be used.
' VB Dim Info as New ProcessStartInfo() Info.FileName = this.tbProcessName.Text Process.Start(Info) // C# ProcessStartInfo Info = new ProcessStartInfo(); Info.FileName = this.tbProcessName.Text; Process.Start(Info);
This code creates an instance of the ProcessStartInfo class to start a specific process. The second overload takes a single String parameter that corresponds to the name of the application. If the application is installed as a program, you can just use the application name. Otherwise, you need to specify the fully qualified file name.
' VB Dim Info as New ProcessStartInfo() String FileName = "C:\ProcessStartDemo.exe" Process.Start(FileName) // C# ProcessStartInfo Info = new ProcessStartInfo(); String FileName = @"C:\ProcessStartDemo.exe"; Process.Start(FileName);
The third overload takes a file name just like the one in the previous example, a String value corresponding to the user s logon user name, and a System.Security.SecureString corresponding to the user s logon password and the domain name.
' VB Dim SecurePassword As New SecureString For i As Int32 = 0 To Me.tbPassword.Text.Length - 1 SecurePassword.AppendChar(Convert.ToChar(Me.tbPassword.Text(i))) Next Process.Start(Me.tbUserName.Text, Me.tbUserName.Text, SecurePassword, Me.tbDomain.Text) // C# SecureString SecurePassword = new SecureString(); for (Int32 i = 0; i < this.tbPassword.Text.Length; i++) { SecurePassword.AppendChar(Convert.ToChar(this.tbPassword.Text[i])); } Process.Start(this.tbUserName.Text, this.tbPassword.Text, SecurePassword , this.tbDomain.Text);
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