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If you want to display text that does not change, you use the literal text. Label controls provide an easy way to display text which can be changed from one execution of a page to the next. This class, along with the class definition in the code file, and system generated code, together make the executable code (assembly) that processes all posted data, generates response, and sends it back to the client. At run-time, the content file is parsed and transformed into a page class.NET runtime codes, and incorporates the state of the server side components in hidden fields. The Web Control class itself and some other server controls that are not visually rendered are derived from the System. List boxes and drop-down lists contain one or more list items.

NET server controls allow calling client side code written using Java Script or VBScript. NET server controls use client side scripting to provide response to the users without posting back to the server. Apart from these scripts, the Button control has a property On Client Click, which allows executing client-side script, when the button is clicked.By default, Visual Studio creates an event handler by including a Handles clause on the Sub procedure. To set it differently you must create a list item object and then add that item to the collection.This clause names the control and event that the procedure handles. Some events are not posted back to the server immediately, these are called non-postback events. The nonpostback events could be made to post back immediately by setting their Auto Post Back property to true. The List Item Collection Editor is used to add item to a drop-down list or list box. To display the collection editor, select edit item from the smart tag menu, or select the control and then click the ellipsis button from the Item property in the properties window.The ASP tag for a button control: Some events cause the form to be posted back to the server immediately, these are called the postback events. For example, the change events or selection events such as Text Box. The default event for the Page object is Load event. For example, default event for the button control is the Click event. Common properties of List Item Collection: A radio button list presents a list of mutually exclusive options.The default event handler could be created in Visual Studio, just by double clicking the control in design view. A check box list presents a list of independent options.

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