create and print barcode c# Passing Data Between Pages in VS .NET

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Passing Data Between Pages
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When developing an ASP.NET application, you frequently need to pass one or more values from one page to another, typically when you display another page by means of a Server.Transfer method. You can pass these values using any of the techniques seen so far for example, cookies, session variables, or static variables. However, if you only want to pass data from one page to the other, all these techniques require that you take the data out of the variable after the new page has read the values, so as not to consume memory unnecessarily. A simpler way to pass a single value from one page to another is by storing it in the Items collection of the HttpContext object, as follows:
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In the sender page...
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Me.Context.Items( quantity ) = 12
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Server.Transfer( ReceivingPage.aspx )
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In the receiver page...
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Dim quantity As Integer = CInt(Me.Context.Items( quantity ))
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In addition, you can leverage the fact that the Context.Handler property returns a refZ erence to the sender page. ASP.NET Web pages are objects; therefore, the receiver page can read any public variable or property in the first page. So your sender page might look like this:
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Part VI:
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In the StartupForm.aspx code-behind class Private Sub Transfer_Click(ByVal sender As Object, ByVal e As EventArgs) _ Handles btnTransfer.Click Server.Transfer( ReceivingPage.aspx ) End Sub The property that wraps the value of a control ReadOnly Property TextValue() As String Get Return txtValue.Text End Get End Property
The receiver page can grab a reference to the sender page by means of the ConZ text.Handler property:
In the ReceivingPage.aspx code-behind class Private Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) _ Handles MyBase.Load If Not Me.IsPostBack Then If TypeOf context.Handler Is StartupForm Then Dim sf As StartupForm = DirectCast(context.Handler, StartupForm) Dim Value As String = sf.TextValue Me.Response.Write( The passed value is & Value) End If End If End Sub
The HttpContext class exposes several other interesting properties, such as TimeStamp (the initial DateTime value for the current HTTP request) and AllErrors (the arrays of errors accumulated while processing an HTTP request). Read the MSDN documentaZ tion for more information.
The Global.asax File
The Global.asax file is the ASP.NET counterpart of Global.asa in ASP and is used to host the handlers of the Application object s events. As you ll see, however, the contents of this file are quite different in ASP.NET. For example, this is a simple Global.asax file (created in Visual Studio) that keeps a counter of how many client sessions are in memory:
Imports System.Web
Imports System.Web.SessionState
Public Class Global Inherits System.Web.HttpApplication Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) We start with zero sessions. Application( SessionCount ) = 0 End Sub
26:
ASP.NET Applications
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) A new session is being created. Application.Lock Application( SessionCount ) = CInt(Application( SessionCount )) + 1 Application.Unlock End Sub Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) A session is being destroyed. Application.Lock Application( SessionCount ) = CInt(Application( SessionCount )) - 1 Application.Unlock End Sub End Class
A couple of things are worth noticing here. First, the events take the usual two arguZ ments and are named Start and End, not OnStart and OnEnd as they are under classic ASP (though the old names are still recognized correctly). Second, they re contained in a class named Global, which inherits from the HttpApplication class. The original ASP Application class has been split into two classes under ASP.NET: HttpApplicationState provides support for application-wide variables, whereas HttpApplication is the class instantiated when the ASP.NET application starts. You can create an empty handler for all these events using the Method Name combo box at the top of the Visual Studio .NET editor, as you do with control events. At first, it s rather confusing that the event templates provided with the default Global.asax are in the form Application_eventname. The ASP.NET Application object exposes many new events that were missing in the ASP object. The majority of these new events norZ mally fire once at every request posted to the server, not just when the application starts or ends. The exception to this frequent firing is the Error event (which one would hope doesn t fire for all requests). All the Application events in Table 26-3 are listed in their firing order.
Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs) Fires at the beginning of each request End Sub
whereas the event templates created with the combo box in the editor are in the form Global_eventname and have a Handles clause:
Sub Global_BeginRequest(ByVal sender As Object, ByVal e As EventArgs) _ Handles MyBase.BeginRequest End Sub
Even though they look different, these event handlers work in exactly the same way. In fact, both of them fire if they re contained in the same Global.asax file, an arrangeZ ment that you ll probably want to avoid in real applications because it adds overhead to each page request and can introduce bugs. An exception to this rule: the Start and End events (as well as their OnStart and OnEnd aliases) can be trapped only if you use
Part VI:
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