generate qr code in asp net c# Methods of the Control Class in Visual C#.NET

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Methods of the Control Class
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The methods of the Control class are listed and described in Table 6-4.
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TABLE 6-4
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Public Methods of a Server Control
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Description
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Applies the properties defined in the page style sheet to the control. The skin properties used depend on the SkinID property. Fires the OnDataBinding event and then invokes the DataBind method on all child controls.
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Method
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ApplyStyleSheetSkin DataBind
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6 ASP.NET Core Server Controls
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Method
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Dispose Focus FindControl
Description
Gives the control a chance to perform clean-up tasks before it gets released from memory. Sets the input focus to the control. Looks for the specified control in the collection of child controls. Child controls not in the Controls collection of the current controls that is, not direct children are not retrieved. Gets the URL that corresponds to a set of route parameters. This method requires ASP.NET 4. Returns the prefixed portion of the UniqueID property of the specified control. Indicates whether the control contains any child controls. Generates the HTML output for the control. Use this method to return a URL suitable for use by the client to access resources on the Web server, such as image files, links to additional pages, and so on. It can return a relative path. The method is sealed and can t be overridden in derived classes. Resolves a relative URL to an absolute URL based on the value passed to the TemplateSourceDirectory property. Internal use method, assigns a delegate to render the control and its content into the parent control.
GetRouteUrl GetUniqueIDRelativeTo HasControls RenderControl ResolveClientUrl
ResolveUrl SetRenderMethodDelegate
Each control can have child controls. All children are stored in the Controls collection, an object of type ControlCollection. This collection class has a few peculiarities. In particular, it post-processes controls that are added to, and removed from, the collection. When a control is added, its view state is restored if needed and view state tracking is turned on. When a control is removed, the Unload event is fired.
Events of the Control Class
The Control class also defines a set of base events that all server controls in the .NET Framework support.
TABLE 6-5
Events of a Server Control
Description
Occurs when the DataBind method is called on a control and the control is binding to a data source Occurs when a control is released from memory the last stage in the control life cycle Occurs when the control is initialized the first step in the life cycle Occurs when the control is loaded into the page; occurs after Init Occurs when the control is about to render its content Occurs when the control is unloaded from memory
Event
DataBinding Disposed Init Load PreRender Unload
Part II
ASP.NET Pages and Server Controls
All server controls are rendered to HTML using the RenderControl method and, when this happens, the PreRender event is fired.
Other Features
Server controls also support some features that are especially related to the returned markup. In the beginning of the ASP.NET era, the focus was primarily on building pages quickly. Nobody really cared much about the emitted markup and its compliance with standards. The relevance of this aspect changed significantly over the years by the way, ASP.NET is now 10 years old. Semantic markup, control over HTML, XHTML compliance, and browser-sensitive rendering are hot topics today. Let s see how ASP.NET controls address them.
Adaptive Rendering
ASP.NET controls are like HTML factories that accept external parameters and produce chunks of markup. As a developer, you can select and filter any parameters being assigned to control properties. As a developer, though, you can hardly control what the component does to generate the markup. The bad effect is that you end up with an HTML markup that might work differently on different browsers and different browser configurations. When this happens, though, the worst thing is that you have no way to fix it the HTML is out of your reach. Before ASP.NET 4, adaptive rendering was the common way to address this problem. Adaptive rendering is the process that enables controls to generate different markup for individual browsers. This result is obtained by delegating the generation of the markup to an external component the adapter. When each control is about to render, it figures out its current adapter and hands the request over to that adapter. Nicely enough, a control adapter is a configurable component that you can declaratively unplug in any application to roll your own. The selected adapter depends on the current browser. The adapter for a control is resolved by looking at the browser capabilities as configured in the ASP.NET browser database. If the browser record includes an adapter class for a given control, the class is instantiated and used. Otherwise, the default adapter for the control is used, which is an instance of the ControlAdapter class. The ControlAdapter class is a generic adapter and simply generates the markup for a control by calling the rendering methods on the control itself. Note The ASP.NET database used for storing browser information is not a real database. It is,
instead, a list of text files with a .browser extension located under the ASP.NET installation folder on the Web server. The exact path is the following:
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