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Asp net validating a checkboxlist control

The basic syntax of Assembly directive is: The Import directive imports a namespace into a web page, user control page of application.If the Import directive is specified in the file, then it is applied to the entire application.

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Event handler is coded to respond to an event, and take appropriate action on it. When the items into a list box are loaded using strings like: lstcolor. Add("Blue"), then both the Text and Value properties of the list item are set to the string value you specify.take place, it sends a message, which is displayed by the label control. These controls contain a collection of List Item objects that could be referred to through the Items property of the control. NET directives are instructions to specify optional settings, such as registering a custom control and page language.When the button is clicked, the Button_Click event is raised and that also sends a message to be displayed on the label. These settings describe how the web forms (.aspx) or user controls (.ascx) pages are processed by the . The syntax for declaring a directive is: In this section, we will just introduce the ASP. The code behind file contains the class definition. NET control tags and literals to form the structure of the page. 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 controls are implemented as classes, and they have events which are fired when a user performs a certain action on them. Basic syntax of list box control: The List Item Collection object is a collection of List Item objects.

For example, when a user clicks a button the 'Click' event is generated. Each List Item object represents one item in the list.

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.

If you want to display text that does not change, you use the literal text.