.NET - ASP.NET

The System.Web.UI.WebControls class is inherited when an ASP.NET server control is added to a Web form.

The following events fire when a page loads:

• Init() - Fires when the page is initializing.
• LoadViewState() - Fires when the view state is loading.
• LoadPostData() - Fires when the postback data is processing.
• Load() - Fires when the page is loading.
• PreRender() - Fires at the brief moment before the page is displayed to the user as HTML.
• Unload() - Fires when the page is destroying the instances of server controls.

Three common properties of validation controls are as follows:

• ControlToValidate - Provides a control to validate
• ErrorMessage - Displays an error message
• IsValid - Specifies if the control's validation has succeeded or not
• Text - Displays a text for validation control before validation

Navigation controls help you to navigate in a Web application easily. These controls store all the links in a hierarchical or drop-down structure; thereby facilitating easy navigation in a Web application.

There are three navigation controls in ASP.Net 4.0.

• SiteMapPath
• Menu
• TreeView