What do I need Protected WithEvents for?
Protected: You have to have this. This is what establishes the link between the instance of the control that is declared in the HTML and the instance in the code-behind.
HTML Markup (mypage.aspx):
<asp:button id="cmdClickMe" runat="server" />
Protected WithEvents cmdClickMe As System.Web.UI.WebControls.Button
WithEvents: This is not always required. This is used to provide the linkup of the event handlers so that you can create a method and use Handles cmdClickMe.Click to wire in the event. If you have a control on a web form that does not require events (which is more likely than not for things like labels or text boxes) you can remove the WithEvents keyword. Usually, the things that need event wiring are buttons, radio buttons, checkboxes, selects (dropdownlist or listbox), etc. If you want to use a text box's OnChanged event, then you would need it.
OptimizationIf you have a lot of controls on a page, it would probably be a little faster if you don't have WithEvents on controls that don't need it. On a page by page basis, you probably wouldn't notice it but once the application is being used my many users at the same time, things will be faster.
Where to Next?
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