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Using the GetFileName() method, you can create a safer logging application that writes information about the user s actions to a text file. In this example, all the logging is performed by calling a Log() method, which then checks for the filename and assigns a new one if the file hasn t been created yet. The text message is then added to the file, along with the date and time information. Private Sub Log(ByVal message As String) ' Check for the file. Dim mode As FileMode If ViewState("LogFile") Is Nothing Then ' First, create a unique user-specific filename. ViewState("LogFile") = GetFileName() ' The log file must be created. mode = FileMode.Create Else ' Add to the existing file. mode = FileMode.Append End If ' Write the message. ' A Using block ensures the file is automatically closed, ' even in the case of error. Dim fileName As String = CStr(ViewState("LogFile")) Using fs As New FileStream(fileName, mode) Dim w As New StreamWriter(fs) w.WriteLine(DateTime.Now) w.WriteLine(message) w.Close() End Using End Sub For example, a log message is added every time the page is loaded, as shown here: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) If (Not Page.IsPostBack) Then Log("Page loaded for the first time.") Else Log("Page posted back.") End If End Sub The last ingredients are two button event handlers that allow you to delete the log file or show its contents, as follows: Protected Sub cmdRead_Click(ByVal sender As Object, ByVal e As System.EventArgs) If ViewState("LogFile") IsNot Nothing Then

If you aren t using the in-process state provider, the SessionStateModuleEnd event won t be fired, and any event handlers for this event in the globalasax file or an HTTP module will be ignored..

Whenever you open a file through a FileStream, remember to call the FileStream.Close() method when Tip you re finished. This releases the handle on the file and makes it possible for someone else to access the file. In addition, because the FileStream class is disposable, you can use it with the using statement, which ensures that the FileStream is closed as soon as the block ends.

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Dim fileName As String = CStr(ViewState("LogFile")) Using fs As New FileStream(fileName, FileMode.Open) Dim r As New StreamReader(fs) ' Read line by line (allows you to add ' line breaks to the web page). Dim line As String Do line = r.ReadLine() If line IsNot Nothing Then lblInfo.Text &= line & "<br>" End If Loop While line IsNot Nothing r.Close() End Using End If End Sub Protected Sub cmdDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) If ViewState("LogFile") IsNot Nothing Then File.Delete(CStr(ViewState("LogFile"))) End If End Sub Figure 13-4 shows the web page displaying the log contents.

With this setting, ASP.NET will use a separate Windows service for state management. Even if you run this service on the same web server, it will be loaded outside the main ASP .NET process, which gives it a basic level of protection if the ASP .NET process needs to be restarted. The cost is the increased time delay imposed when state information is transferred between two processes. If you frequently access and change state information, this can make for a fairly unwelcome slowdown. When using the StateServer setting, you need to specify a value for the stateConnectionString setting. This string identifies the TCP/IP address of the computer that is running the StateServer service and its port number (which is defined by ASP.NET and doesn t usually need to be changed). This allows you to host the StateServer on another computer. If you don t change this setting, the local server will be used (set as address 127.0.0.1). Of course, before your application can use the service, you need to start it. The easiest way to do this is to use the Microsoft Management Console. Select Start Programs Administrative Tools Computer Management (you can also access the Administrative Tools group through the Control Panel). Then select the Services and Applications Services node. Find the service called ASP .NET State in the list, as shown in Figure 6-6.

You can write to a file and read from a file using the StreamWriter and StreamReader classes in the System.IO namespace. When creating these classes, you simply pass the underlying stream as a constructor argument. For example, here s the code you need to create a StreamWriter using an existing FileStream: FileStream fileStream = new FileStream(@"c:\myfile.txt", FileMode.Create); StreamWriter w = new StreamWriter(fileStream); You can also use one of the static methods included in the File and FileInfo classes, such as CreateText() or OpenText(). Here s an example that uses this technique to get a StreamWriter: StreamWriter w = File.CreateText(@"c:\myfile.txt"); This code is equivalent to the earlier example.

Of course, in some cases you do need to update the same file in response to actions taken by multiple users. One approach is to use locking. The basic technique is to create a separate class that performs all the work of retrieving the data. Once you ve defined this class, you can create a single global

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