how to generate qr code in c# web application Label Literal TextBox CheckBox RadioButton DropDownList ListBox Button in Visual C#.NET

Encoding QR-Code in Visual C#.NET Label Literal TextBox CheckBox RadioButton DropDownList ListBox Button

Label Literal TextBox CheckBox RadioButton DropDownList ListBox Button
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Use HTML controls when you do not need the advanced features of web server controls.
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Estimated lesson time: 45 minutes
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Web Server Controls
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ASP.NET provides programmers with a set of web server controls for creating webpages. These controls provide more functionality and a more consistent programming model than HTML server controls. Web server controls are based on .NET Framework classes, typically inherited from the WebControl class. Unlike HTML controls, web server controls are not part of the HTML standard. However, ASP.NET renders web server controls as standardized HTML. In other words, if you use the Button web server control, ASP.NET renders it using the <button> HTML markup tag.
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Lesson 1: Exploring Common Server Controls
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ChAPTER 4
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A web server control is able to provide more functionality than an HTML control because it is not tied to a single HTML tag element. Instead, web server controls typically render many HTML tags and might also include client-side JavaScript code. They also have the ability to detect the web browser s capabilities and render the appropriate HTML based on those capabilities. This allows ASP.NET web server controls to use a specific browser to its fullest potential. The programmer is also relieved from dealing with the actual HTML and instead works with the web server control to define the appropriate functionality for the page. This allows developers to use controls that would otherwise require very complex HTML, such as the Calendar, Wizard, Login, and GridView controls.
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Adding Web Server Controls by Using Source View
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In previous chapters, you added web server controls by dragging them from the Toolbox in the Visual Studio designer. You can also add them to a webpage by using Source view:
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1. 2. 3.
Open the webpage in Visual Studio. Click the Source tab at the bottom of the webpage. In the Source view of the webpage, type the web server control element and its attributes (see Figure 4-1). Alternatively, you can drag a control from the Toolbox directly into the page source.
FigURE 4-1 Adding a web server control to a page in Source view.
Note that web server controls must be located within an HTML form element that has the runat= server attribute defined.
ChAPTER 4
Using Server Controls
Setting Web Server Control Properties
Most web server controls inherit from the WebControl class. All web server controls must contain a unique (at the page level) ID attribute value to provide a way to programmatically reference the control. The other attributes and properties of a web server control are used to control the look and behavior of the control. Table 4-1 lists the frequently used attributes and properties that all web server controls have in common.
TAbLE 4-1 Common Web Server Control Properties
PROPERTy
DEsCRiPTiOn
AccessKey
The keyboard shortcut key. AccessKey can specify a single letter or number that the user can press while holding down Alt. For example, specify Q if you want the user to press Alt+Q to access the control. The background color of the control, which can be set by using standard HTML color identifiers, such as red or blue, or RGB values expressed in hexadecimal format (#ffffff). The border color of the control, which can be set by using standard HTML color identifiers, such as black or red, or RGB values expressed in hexadecimal format (#ffffff). The width of the control s border in pixels. BorderWidth is not fully supported for all controls in browsers earlier than Windows Internet Explorer 4.0. The border style, if there is any. Possible values are NotSet, None, Dotted, Dashed, Solid, Double, Groove, Ridge, Inset, and Outset. The cascading style sheets class to assign to the control. A list of all cascading style sheet properties that are applied to the specified HTML server control. An attribute that disables the control when set to false. This dims the control and makes it inactive. It does not hide the control. The default is true, which enables themes for this control. The default is true, which enables view state persistence for the control. An attribute that contains subproperties that you can declare by using the property-subproperty syntax in the opening tag of the web server control element. For example, you can make a web server control s text italic by including the Font-Italic attribute in its opening tag. The foreground color of the control. ForeColor is not fully supported for all controls in browsers earlier than Internet Explorer 4.0. The control s height. The Height property is not fully supported for all controls in browsers earlier than Internet Explorer 4.0. (continued)
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