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If you re familiar with HTML forms, you know there is one basic way to submit a page by clicking a submit button. If you re using the standard HTML server controls, this is still your only option. However, once the page is posted back, ASP .NET can fire other events at the same time (namely, events that indicate that the value in an input control has been changed). Clearly, this isn t enough to build a rich web form. Fortunately, ASP .NET web controls extend this model with an automatic postback feature. With this feature, input controls can fire different events, and your server-side code can respond immediately. For example, you can trigger a postback when the user clicks a check box, changes the selection in a list, or changes the text in a text box and then moves to another field. These events still aren t as fine-grained as events in a Windows application, but they are a significant step up from the submit button.

Next, you have to create a custom login page. This page collects a user name and password from the user and validates it against the credentials stored in the credential store. If credentials are stored in web.config, this is extremely easy; it s not much harder having credentials stored in any other store such as an external database. The login page you have to create must contain the parts shown in Figure 20-2. Furthermore, you must include the code for validating the credentials.

The <authentication> element can be used only in the web.config that is in the root directory of an application. Attempting to use it in a subdirectory will cause an error. This means that only one authentication type can be defined for each application. However, different subdirectories can define different authorization rules.

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To use automatic postback, you simply need to set the AutoPostBack property of a web control to True (the default is False, which ensures optimum performance if you don t need to react to a change event) When you do, ASPNET uses the client-side abilities of JavaScript to bridge the gap between client-side and server-side code Here s how it works: if you create a web page that includes one or more web controls that are configured to use AutoPostBack, ASPNET adds a JavaScript function to the rendered HTML page named __doPostBack() When called, it triggers a postback, posting the page back to the web server with all the form information ASPNET also adds two hidden input fields that the __doPostBack() function uses to pass information back to the server.

Figure 20-2. A typical login page for a web application The ASP.NET page shown in Figure 20-2 contains the text boxes for entering the values. Note that the URL includes the originally requested page as a query parameter. This parameter is used by the FormsAuthentication class later for redirecting to the originally requested page. If not present, it uses the page configured in the defaultUrl attribute of the <forms /> configuration tag. What you cannot see in Figure 20-2 are validation controls. Validation controls are especially important to let the user enter only valid values for a user name and a password. Remember what we mentioned in the previous chapter: never trust user input. Validation adheres to this principle by ensuring that only valid values are entered. Here you can see all the controls contained on the login page: <form id="form1" runat="server"> <div style="text-align: center"> Please Log into the System<br /> <asp:Panel ID="MainPanel" runat="server" Height="90px" Width="380px" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px"> <br /> <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tr> <td width="30%" style="height: 43px"> User Name:</td> <td width="70%" style="height: 43px"> <asp:TextBox ID="UsernameText" runat="server" Width="80%" /> <asp:RequiredFieldValidator ID="UsernameRequiredValidator" runat="server" ErrorMessage="*" ControlToValidate="UsernameText" /> <br /> <asp:RegularExpressionValidator ID="UsernameValidator" runat="server" ControlToValidate="UsernameText" ErrorMessage="Invalid username" ValidationExpression="[\w| ]*" /> </td>

ASP .NET provides three core authentication modules: FormsAuthenticationModule WindowsAuthenticationModule PassportAuthenticationModule The following sections briefly describe each module.

This information consists of the ID of the control that raised the event and any additional information that might be relevant These fields are initially empty, as shown here: <input type="hidden" name="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" value="" /> The __doPostBack() function has the responsibility for setting these values with the appropriate information about the event and then submitting the form A sample __doPostBack() function is shown here: <script type="text/javascript"> <!-function __doPostBack(eventTarget, eventArgument) { if(!theFormonsubmit || (theFormonsubmit() != false)) { theForm__EVENTTARGETvalue = eventTarget; theForm__EVENTARGUMENTvalue = eventArgument; theFormsubmit(); } } // --> </script> Remember, ASPNET generates the __doPostBack() function automatically This code grows lengthier as you add more AutoPostBack controls to your page, because the event data must be set for each control.

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