HTML server control classes in ASP.NET

March 05, 2014 0 Comments

ASP.NET uses the HTML server control classes to work with the HTML controls using a programming language. These classes include the HtmlTextArea class for the HTML <textarea> controls, the HtmlInputButton class for HTML buttons created with the <input type="button"> elements, the HtmlInputText class for HTML text fields created with the <input type="text"> elements, and the rest. while working with HTML server control, you are actually working with their supporting classes. You can even work with these classes directly in code.
Most of the attributes of HTML server controls can be specified through the properties window of IDE. These properties are written in lowercase. As soon as you change or specify the value of these properties, the corresponding changes are made to the HTML element in the .aspx page. For example, you can set the caption of an HTML server button at design-time using the Value property, which corresponds to the HTML <Input> element's value attribute. However, at runtime, this attribute is supported by the HtmlInputButton class's Value property. When we work with an object of the HtmlInputButton class on the server, the casing (upper or lower case) of property name in server code adheres to the coding language standard.
It is important to know that the HTML server control classes exactly correspond to the actual HTML controls that you see in the HTML tab in ToolBox. For example, the HtmlInputButton class is used not just for buttons but also for reset buttons. All these buttons are created using an HTML <input> element, and they differ only through the attribute named type; for example, a standard button uses <input type="button">, a reset button uses <input type="reset">, and a submit button uses <input type="submit">.

Note : As per HTML rules, the HTML controls must be in the HTML form(with .htm or .html extension) while they are sent back to the server. However, when you create a web form using the ASP.NET IDE, you need not require to create the HTML form explicitly; ASP.NET does that automatically as soon as you add a new web form to the website.

HTML classes are based on the HtmlControl class. Some server control class are listed in

HtmlAnchor : Creates an <a> element for navigation.

HtmlButton : Creates an HTML button using the <button> element.

HtmlForm : Allows access to the <form> HTML element which is a container for other controls on a web page.

HtmlgenericControl : Defines the methods, properties and events for all HTML server controls not represented by .NET Framework.

HtmlImage : Maps the <img> element for displaying image on a web page.

HtmlInputButton : Creates an Html button using the <input> element.

HtmlInputCheckBox : Creates an Html checkbox.

HtmlInputControl : Defines the methods, properties and events for HTML input controls.

HtmlInputFile : Creates an HTML file upload control.

HtmlInputHidden : Creates an HTML input hidden control.

HtmlInputImage : Creates an HTML button that display image.

HtmlInputRadioButton : Creates an HTML radio button.

HtmlInputText : Creates an HTML text field. You can also use this control to create password fields.

HtmlSelect : Maps <select> element and allow to create list control.

HtmlTable : Creates an HTML table.

HtmlTableCell : Creates an HTML cell in a Table.

Jacob Lefore

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