generate qr code in asp net c# HTML Controls in C#

Creating QR-Code in C# HTML Controls

HTML Controls
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HTML server controls look like plain HTML tags, only with an extra runat=server attribute. The additional runat attribute makes a huge difference, however. In ASP.NET, by simply adding the runat attribute, you can bring to life otherwise dead HTML text and transform it into a living instance of a server-side component. After it s transformed into a server object, the original HTML tag can be configured programmatically using an object-oriented approach.
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Part II
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ASP.NET Pages and Server Controls
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By design, HTML controls expose a set of methods and properties that carefully reflect the HTML syntax. For example, to set the default text of an input form field, you use a property named Value instead of the more expressive Text. The name of the server control is determined by the value of the ID attribute. The following code snippet shows how to define a server-side input tag named lastName:
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<input runat="server" id="lastName" type="text" />
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In the example, the tag declaration does not include an explicit value for the Value attribute. You can also set it programmatically as follows:
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void Page_Load(object sender, EventArgs e) { lastName.Value = "Esposito"; }
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After being processed by the ASP.NET runtime, the preceding declaration generates the following HTML code, which is forwarded to the browser:
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<input name="myName" id="myName" type="text" value="Esposito" />
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Notice that a server-side ID attribute expands to a pair of HTML attributes: Name and ID. The W3C HTML specification says that the attribute name is used for posting forms to the server; the id attribute is used, instead, for client-side purposes. In no way does this mean that on the server Name and ID can be interchangeably used to name the server instance of the control. The name of the server control instance is given by ID. If you specify both Name and ID on a server-side tag, the value assigned to Name will be silently overridden.
Generalities of HTML Controls
The .NET Framework provides predefined server controls for commonly used HTML elements such as <form>, <input>, and <select>, as well as for tables, images, and hyperlinks. All the predefined HTML server controls inherit from the same base class the HtmlControl class. In addition, each control then provides its own set of specific properties and its own events. Controls typically supply properties that allow you to manipulate the HTML attributes programmatically from within server code. HTML controls integrate well with data binding and the ASP.NET state maintenance, and they also provide full support for postback events and client scripting. For example, for a button that gets clicked, you can have some JavaScript code running on the client responding to the onclick event as well as some code that handles the event on the server if the page posts back as the result of that event.
6 ASP.NET Core Server Controls
HTML controls are defined in the System.Web.UI.HtmlControls namespace. Most, but not all, HTML tags have a direct control counterpart in the ASP.NET framework. HTML elements that don t map to a made-to-measure server control are rendered through the HtmlGenericControl class and have attributes set using generic collections rather than direct properties. Generic controls include <iframe>, <hr>, <font>, and <body>. In general, you should bear in mind that every element that can appear in an HTML page can be marked as runat= server and programmed and styled on the server.
The HtmlControl Base Class
The HtmlControl class inherits from Control and defines the methods, properties, and events common to all HTML controls. Actually, many properties and all methods and events are simply inherited from the base class. Table 6-6 shows the list of properties specific to HTML controls.
TABLE 6-6
Specific Properties of an HTML Control
Description
Gets a collection object representing all the attributes set on the control with the corresponding value Gets or sets a Boolean value, which indicates whether the HTML control is disabled Gets a collection object representing all CSS properties applied to the control Gets the name of the HTML tag behind the control
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