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As you can see, the control is nearly completely customizable through these properties. But as you probably have seen, you cannot define any validation expressions for validating the input. Of course, you can do validation on the server side within the event procedures offered by the Login control. However, generally, if you want to add any controls to the Login control, you can t do that

through the properties introduced previously. For example, what if you have an additional text box for strong authentication with a second password or user access key as on some governmental pages Fortunately, the Login control supports templates just as other controls such as the GridView control do. With templates, you can customize the contents of the Login control without any limitations. You can add any controls you want to your Login control. You can use a custom template for the Login control through the LayoutTemplate tag as follows: <asp:Login ID="LoginCtrl" runat="server" BackColor="aliceblue" BorderColor="Black" BorderStyle="double"> <LayoutTemplate> <h4>Log-In to the System</h4> <table> <tr> <td> User Name: </td> <td> <asp:TextBox ID="UserName" runat="server" /> <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName" ErrorMessage="*" /> <asp:RegularExpressionValidator ID="UsernameValidator" runat="server" ControlToValidate="UserName" ValidationExpression="[\w| ]*" ErrorMessage="Invalid User Name" /> </td> </tr> <tr> <td> Password: </td> <td> <asp:TextBox ID="Password" runat="server" TextMode="Password" /> <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password" ErrorMessage="*" /> <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="Password" ValidationExpression='[\w| !" $%&/()=\- \*]*' ErrorMessage="Invalid Password" /> </td> </tr> </table> <asp:CheckBox ID="RememberMe" runat="server" Text="Remember Me" /> <asp:Literal ID="FailureText" runat="server" /><br /> <asp:Button ID="Login" CommandName="Login" runat="server" Text="Login" /> </LayoutTemplate> </asp:Login>

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With the right controls and the correct ID values for these controls in place, you don t need to write any code for handling events. The code just works as usual except that you define the set of controls and the layout of these controls. Actually, the Login control requires at least two text boxes with the IDs UserName and Password. If those two text boxes are missing (or don t have these ID values), the control throws an exception. All the other controls are optional, but if you specify corresponding ID values (such as Login for the login button), the Login control automatically handles their events and behaves as when you used the predefined layouts for the control. Table 21-8 lists the special ID values, their required control types, and whether they are required or optional. Table 21-8. Special Controls for the Login Template

That s all it takes to preserve the directory information long enough to get it into the tag. Once the node is parsed and the directory is retrieved, it s not used for anything else, so it doesn t need any special functionality.

System.Web.UI.WebControls.Textbox System.Web.UI.WebControls.Textbox System.Web.UI.WebControls.CheckBox System.Web.UI.WebControls.Literal Any control that supports event bubbling and a CommandName

The control with the ID Login can be any control that supports event bubbling and a CommandName property. It is important that you set the CommandName property to Login, because otherwise it will not be recognized in the event-handling process by the Login control. You can also add controls with other IDs that are not related to the Login control at all. The previous code includes RequiredFieldValidator and RegularExpressionValidator controls for validating the user name and password fields appropriately. If you don t add a control with the CommandName set to Login, you have to handle the event of the control yourself and write the appropriate code for validating the user name and password and for redirecting to the originally requested page. When using the LayoutTemplate, many of the properties originally offered by the control are not available anymore. Only the following properties are available when using the template: DestinationPageUrl VisibleWhenLoggedIn FailureAction MembershipProvider Password Username RememberMeSet All the style properties and several properties for configuring text contents of default controls are not available anymore, because you can add them manually as separate controls or static text to the template for the Login control.

The Login control supports a couple of events and properties that you can use to customize the behavior of the control. This gives you complete control over customizing the Login control (used along with the other customization possibilities such as templates or custom style properties). The Login control supports the events listed in Table 21-9.

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