create and print barcode c# Internet Applications in .NET

Printer QR in .NET Internet Applications

Internet Applications
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The filename is equal to the value of this cookie.
Barcode Generator In .NET
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Decoding Barcode In .NET
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Dim permSessionId As String = cookie.Value
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Build the name of the data file.
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Dim filename As String = SESSIONDATAPATH & permSessionID.ToString & .xml"
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UCC-128 Generation In .NET
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Open the file, or exit if error.
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fs = New FileStream(filename, FileMode.Open)
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Deserialize the Hashtable that contains values.
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Dim ht As Hashtable = DirectCast(sf.Deserialize(fs), Hashtable)
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Move data into the Session collection.
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Read Code 128 In Visual Studio .NET
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Session.Clear() Clear regular Session values.
For Each key As String In ht.Keys
Session(key) = ht(key) Next Catch ex As Exception Ignore any exceptions. Finally If Not (fs Is Nothing) Then fs.Close() End Try End Sub
When the request has been served, the code in the ReleaseRequestState event handler creates a server-side XML file whose name is taken from the PermSessionID cookie that was read or created previously. It then serializes all session variables to the XML file and clears the Session collection to minimize the server s memory usage:
Private Sub Application_ReleaseRequestState(ByVal sender As Object, _ ByVal e As EventArgs) Get the special cookie.
Dim cookie As HttpCookie = Request.Cookies( PermSessionID )
The value of the cookie is the name of the .xml file.
Dim permSessionID As String = cookie.Value
Move data from the Session collection into a Hashtable.
Dim ht As New Hashtable(Session.Count)
For Each key As String In Session.Keys
ht(key) = Session(key) Next Clear the regular session collection, to save memory. Session.Clear() Dim fs As FileStream
Dim sf As New SoapFormatter()
Build the name of the data file. Dim filename As String = _ SESSIONDATAPATH & permSessionID.ToString & .xml" Open the file for output, or exit if error. fs = New FileStream(filename, FileMode.Create) Serialize the Hashtable that contains values. sf.Serialize(fs, ht) Catch ex As Exception Ignore any exceptions.
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Finally If Not (fs Is Nothing) Then fs.Close() End Try End Sub
ASP.NET Applications
Notice that the c:\SessionData directory shouldn t be accessible from the outside world, for obvious security reasons, so it isn t under the Inetpub\wwwroot directory tree. Moreover, this directory will be accessed by the ASP.NET process, so it must be located on a non-NTFS partition or it must have been configured to allow access to the account that ASP.NET runs under. By default, this account is the Network Service account (on Windows Server 2003 when Internet Information Services is running in IIS 6 isolation mode) or the ASPNET account (in all other cases). Next, create a simple test page that increments a session variable:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As EventArgs) _ Handles MyBase.Load If Session( counter ) Is Nothing Then Session( counter ) = 0 Else Session( counter ) = CInt(Session( counter )) + 1 End If Display current value of the variable. lblCounter.Text = Counter = & Session( counter ).ToString End Sub
Each time you refresh the page, the counter is incremented. However, if you now close the browser and restart the application, you ll see that the counting doesn t restart at 0 because the session state is restored from the XML file on the server! This technique has another great advantage: if XML data files are stored on a network shared directory, you can implement session variables distributed over a Web farm without using SQL Server (which might be an issue if your site uses another database server) and without the single-point-of-failure problem that you have if you manage distributed sessions with the aspnet_state Windows service. The performance of the preceding code is in the same range as that achieved with SQL Server, and you can make it faster if you persist session values as binary data instead of XML. As provided, the code doesn t address a minor problem. When the client-side code expires (for example, after one week), you should delete the corresponding data file on the server to reclaim disk memory and make file searches faster. You can solve this problem by creating a Windows service that periodically checks the date of the last access to XML files and deletes those that are older than one week. This isn t a critical issue, however, because session data files that aren t deleted as soon as they expire don t take any server resource except disk space, so a site administrator could even perform these cleanup chores manually once every few days.
Part VI:
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