generate qr code asp.net mvc s BASICS OF WEB DEVELOPMENT WITH ASP.NET in Visual Basic .NET

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CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
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Figure 2-2. New Web Site dialog box
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Exploring the IDE
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Once you ve created the web site, the IDE will launch and you will be able to edit your new web site, as shown in Figure 2-3. VWDE provides you with a fully featured IDE that enables you to edit and maintain your web application. The IDE is divided into several distinct areas; we ll take a brief tour of them now.
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The Toolbox
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On the left side of the screen is the Toolbox, which enables you to drag and drop controls onto your web application. Controls can be either ASP.NET server controls, which wrap basic HTML controls but provide for a greatly enhanced programming interface; or standard controls, which represent basic HTML controls, such as buttons, input text controls, and lists, but without the enhanced programming interface (their programming interface mimics the basic control itself). Both types of controls are rendered into raw HTML when the page is compiled, which occurs either beforehand if you like, or when the page is first accessed on the server.
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CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
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Figure 2-3. The VWDE IDE
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Figure 2-4 shows the Toolbox with each group of controls hidden in collapsed tree control nodes commonly referred to as tabs (even though this isn t a Tab control!).
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Figure 2-4. The Toolbox
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CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
The Toolbox gathers all your controls into logical groupings, accessed by tabs. Following is the default set of tabs: Standard: Contains the standard suite of ASP.NET server controls Data: Contains the suite of ASP .NET server controls that can be bound to data Validation: Contains the suite of ASP.NET server controls that can be used to validate user input Navigation: Contains the suite of ASP.NET server controls that can be used to build navigation on a web site Login: Contains the ASP .NET server controls for login and user management WebParts: Contains server controls used to build SharePoint WebParts applications HTML: Contains standard, generic HTML controls General: Empty by default, but can be used as a scratch pad for your favorite controls You aren t limited to this group of tabs or the controls that they contain. You can right-click the Toolbox to add or remove tabs and to add or remove controls from a tab.
s Note Did you know that you can put code snippets in the Toolbox, too Simply highlight them, and then
drag and drop them onto the Toolbox!
It s pretty common for people to use a third-party or add-on control that isn t part of the default control suite. To add a new tab, right-click a blank area in the Toolbox and select Add Tab to create a new tab for your control (see Figure 2-5). A new tab with a text box placeholder appears. Type a name for the new tab (e.g., My Controls) and press Enter. You ll now have a new, empty tab on which you can place your controls.
CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
Figure 2-5. Adding a new tab
The next step is to add controls to the new tab. To do this, right-click in the blank area on the tab and select Choose Items from the context menu (see Figure 2-6).
Figure 2-6. Adding a new control to your tab
CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
The Choose Toolbox Items dialog box will appear, as shown in Figure 2-7. This dialog box enables you to add either .NET Framework components, which are components written in managed code that will run anywhere you have the .NET Framework runtime, or Component Object Model (COM) components. COM components are binary components written in unmanaged code that may not necessarily run anywhere because all their binary dependencies are necessary. Remember this limitation when using COM components in a web application: You ll need to provide installers for the COM components so that your users can access them. Additionally, when COM components are used in .NET applications, the IDE will generate an interoperability (interop) layer that is used to communicate between the managed and the unmanaged worlds. If you are planning to use the COM components only on the server side, you ll still need to make sure that the deployment server has the full COM component and all its dependencies installed and versioned correctly, as well as the interop assemblies.
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