.net core barcode

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you ll encounter when you update them, and the easier it is to have different developers working on each. Most websites require some interaction between the master and content pages, however. When a website requires a dependency, make the content page reference the master page, and not the other way around. Because you will have many different content pages for each master page, referencing methods, properties, or controls on content pages is bound to cause problems. Though we don t discuss this in this book, you can use events to communicate between master and content pages. For example, if you need content pages to adjust their content based on the selection users make from a drop-down list on the master page, you could expose an event on the master page that is triggered when the user makes a choice. Then, content pages could subscribe to the event. In this way, the master page is sending messages directly to the content page but the master page is not directly dependant on the content page. If another developer creates a content page and doesn t respond to the event, it won t cause a problem for the master page.

This will disable both clientside and server-side validation, something that you d likely want to do on a cancel button Enhancing Design-Time Support Referring back to Figure 6-7, notice the selected control, which reads RequiredTextBox Designer By default, a control in design mode will show just what would be displayed by a call to RenderControl If this call would result in nothing being displayed, Visual Studio NET will instead display the type and ID of the control, something like RequiredTextBox:RequiredTextBox1 If you want to create your own display in the designer, you do have a few alternatives The usual way to display the text is to use the Designer attribute for the class In Listing 6-8, the Designer attribute is specified as follows: Designer("MyControlsRequiredTextBoxDesigner, RequiredTextBox") The Designer attribute tells the design-time environment that MyControls.

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Content pages can reference any public property declared in the master page code-behind file. For example, the following code sample defines the property SharedInfo in the master page code-behind file. In this example, the master page provides strong typing for the session variable, SharedInfo.

VPN server on the Internet reachable, the following static route is created:

Sample of Visual Basic Code Public Property SharedInfo() As String Get Return CType(Session("SharedInfo"), String) End Get Set(ByVal value As String) Session("SharedInfo") = value End Set End Property

Sample of C# Code public String SharedInfo { get { return (String)Session["SharedInfo"]; } set { Session["SharedInfo"] = value; } }

Interface: The WAN adapter attached to the Internet Destination: 207.209.68.1 Network Mask: 255.255.255.255 Gateway: 0.0.0.0 Metric: 1 Note Because the WAN adapter creates a point-to-point connection to the ISP , any address can be entered for the gateway. The gateway address of 0.0.0.0 is an example. (0.0.0.0 is known as the unspecified IP address.)

Session variables are an easy way to store user-specific information during a user s visit. Similarly, application variables store information that can be accessed by any user. Neither provides strong typing, however, which makes exposing them by using public properties a useful way to access these shared objects. For more information about session and application variables, refer to 3, Handling Events and Managing State.

RequiredTextBoxDesigner is the class that will serve as the designer and that it s in the RequiredTextBox assembly In some examples, I ve seen the dll extension explicitly specified to identify the assembly, but this extension isn t required, and for consistency with other parts of ASPNET such as the @ Register directive, I ve omitted it here The designer class is often in a subsidiary namespace for example, something like MyControlsDesign The designer class can be in any namespace and in any assembly Placing the designer in the same assembly as the component is more convenient and imposes additional size in the assembly, even if the control will never be used in design mode No runtime performance penalty is incurred, however, for having the designer in the same assembly The RequiredTextBoxDesigner class, at the bottom of Listing 6-8, derives from the ControlDesigner class.

You must add the @ MasterType declaration to the ASPX content page to reference master properties in a content page. This declaration is added just below the @ Page declaration. The following code demonstrates this.

<%@ Page Language="VB" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Login.aspx.vb" Inherits="Login" title="Contoso Login" %> <%@ MasterType VirtualPath="~/Site.master" %>

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