ASP.NET in a Nutshell

Name

Button

Synopsis

This class represents a simple command button (also known as a push button). Button controls always generate a postback when clicked. As with all button-like server controls, you can set the CausesValidation property to determine whether page validation will be performed when the button is clicked, before the button event handling code is executed. Depending on the client browser’s support for DHTML, an invalid page may prevent the postback from occurring and the button event handling code from executing if CausesValidation is True.

When clicked, a Button raises a Click event followed by a Command event. The Command event passes extra information about the button in a CommandEventArgs object. This information includes the CommandName and CommandArgument properties of the Button. A typical CommandName identifies the requested action (like “Sort”).

Public Class Button : Inherits WebControl : Implements_
       System.Web.UI.IPostBackEventHandler
' Public Constructors
   Public Sub New() 
' Public Instance Properties
   Public Property CausesValidation As Boolean  
   Public Property CommandArgument As String  
   Public Property CommandName As String  
   Public Property Text As String  
' Protected Instance Methods
   Overrides Protected Sub AddAttributesToRender(
        ByVal writer As System.Web.UI.HtmlTextWriter) 
   Overridable Protected Sub OnClick(ByVal e As EventArgs) 
   Overridable Protected Sub OnCommand(
        ByVal e As CommandEventArgs) 
   Overrides Protected Sub RenderContents( ByVal writer As System.Web.UI.HtmlTextWriter) ...