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</tr> <tr> <td width="30%" style="height: 26px"> Password:</td> <td width="70%" style="height: 26px"> <asp:TextBox ID="PasswordText" runat="server" Width="80%" TextMode="Password" /> <asp:RequiredFieldValidator ID="PwdRequiredValidator" runat="server" ErrorMessage="*" ControlToValidate="PasswordText" /> <br /> <asp:RegularExpressionValidator ID="PwdValidator" runat="server" ControlToValidate="PasswordText" ErrorMessage="Invalid password" ValidationExpression='[\w| !" $%&/()=\- \*]*' /> </td> </tr> </table> <br /> <asp:Button ID="LoginAction" runat="server" OnClick="LoginAction_Click" Text="Login" /><br /> <asp:Label ID="LegendStatus" runat="server" EnableViewState="false" Text="" /> </asp:Panel> </div> </form> As mentioned previously, the validation controls serve two purposes First, the RequiredFieldValidator controls ensure that both a user name and password are entered in a valid format containing only the characters allowed for user names and passwords Second, the RegularExpressionValdiator controls ensure that only valid values are entered in the User Name text field and in the Password text field For example, the user name may contain letters, digits, and spaces only.

The FormsAuthenticationModule module uses forms authentication, which allows you to design your own login pages, write your own authentication logic, but rely on ASP.NET to track user and role information using an encrypted cookie. The FormsAuthenticationModule module is active when the <authorization> element is set as follows: <authentication mode="Forms" /> 20 explores forms authentication in more detail. (You can also use forms authentication with the Membership API and the Roles API, which are introduced later in this chapter and covered in detail in 20.)

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Finally, any control that has its AutoPostBack property set to True is connected to the __doPostBack() function using the onClick or onChange attribute These attributes indicate what action the browser should take in response to the client-side JavaScript events onClick and onChange The following example shows the tag for a list control named lstCountry, which posts back automatically Whenever the user changes the selection in the list, the client-side onChange event fires The browser then calls the __doPostBack() function, which sends the page back to the server <select id="lstCountry" onchange="__doPostBack('lstCountry','')" language="javascript"> In other words, ASPNET automatically changes a client-side JavaScript event into a server-side ASP NET event, using the __doPostBack() function as an intermediary If you re a seasoned ASP developer, you may have manually created a solution like this for traditional ASP web pages ASP NET handles these details for you automatically, simplifying life a great deal..

The WindowsAuthenticationModule module works in conjunction with IIS to perform Windows authentication. This module is active when the <authentication> element in the web.config file is set as follows: <authentication mode="Windows" /> 22 explores Windows authentication in more detail.

Therefore, the validation expression looks like this: ValidationExpression="[\w| ]*" The \w character class is equivalent to [a-zA-Z_0-9], and the space afterward allows spaces in the user name The password, for example, may also contain special characters Therefore, the validation expression looks different from the previous one, as shown here: ValidationExpression='[\w| !" $%&/()=\- \*]*' Note that the single quote is used for enclosing the attribute value, because this uses the double quote as the allowed special character Furthermore, because the attribute is contained in the tag code (and therefore the HTML entity), & indicates that the ampersand (&) character is allowed in the password You can see the validation controls in action in Figure 20-3 As you can see in Figure 20-3, with validation controls in place you can stop users from entering values for the user name or password that would lead to a SQL injection attack.

SQL Server 2005 supports a file-only database mode that allows you to access SQL Server databases directly through their MDF files without creating or attaching them in a SQL Server instance. With this feature it is possible to just copy the application s database file with the application files onto the target server and run the application. The SQL Server provider then uses a connection string that accesses the database file directly. SQL Server automatically attaches the database (temporarily)

PassportAuthenticationModule is active when the <authentication> element in the web.config file is set as follows: <authentication mode="Passport" /> The PassportAuthenticationModule module provides a wrapper for Microsoft s Passport authentication service. When using Passport, users are authenticated using the information in Microsoft s Passport database (the same technology that powers the free Hotmail e-mail system). The advantage of Passport is that you can use existing user credentials (such as an e-mail address and password), without forcing users to go through a separate registration process. The disadvantage is that you need to enter into a licensing agreement with Microsoft and pay a yearly fee based on use. ASP.NET doesn t include full support for Passport authentication. To use it successfully, you ll need to download and install the Passport .NET SDK on your web server. This book doesn t cover Passport, but you can learn more (and download the SDK) at http://www.microsoft.com/net/ services/passport.

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