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<script language="C#" runat=server>
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void Login_Click(Object sender, EventArgs E) { // Authenticate user: This sample accepts only one user with // a name of doug@programmingasp.net and a password of // password if ((UserEmail.Value == "doug@programmingasp.net") && (UserPass.Value == "password")) { FormsAuthentication.RedirectFromLoginPage( UserEmail.Value,false); } else { Msg.Text = "Invalid Credentials: Please try again"; } } </script>
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<body> <form runat=server> <center> <h3> <font face="Verdana" color=blue>Login Page</font> </h3> <table> <tr> <td> Email: </td> <td>
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<input id="UserEmail" type="text" runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserEmail" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td> Password: </td> <td> <input id="UserPass" type=password runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserPass" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td colspan=3 align="center">
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<asp:button text="Login" OnClick="Login_Click" runat=server> </asp:button> <p> <asp:Label id="Msg" ForeColor="red" Font-Name="Verdana" Font-Size="10" runat=server /> </td> </tr> </table> </center> </form> </body> </html>
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Login.aspx has a great deal in common with both a traditional ASP page and a traditional HTML page. At the very top of the page is an import declaration, used to import the System.Web.Security namespace. As you might recall, Login.aspx is the page that users will be redirected to when they first visit the site, specified by a configuration setting in the Web.config file. The System.Web.Security namespace is used to enable the page to properly redirect the user to the page initially requested. ASP.NET In traditional ASP programming, one way to import Differences functionality into a page was to use include statements. ASP.NET supports the import statement that allows you to import namespaces. However, the .NET implementation does not allow wildcards in the import as Java does that is, you can t import System.Web.* and then use the System.Web.Security namespace. After the <HTML> start tag comes a script block, delimited by <SCRIPT> </SCRIPT> tags. The script block contains a single C# function, Login_Click. This function does little more than compare some values from the form to some hard-coded values and either uses a method from System.Web.Security.FormsAuthentication to redirect the user back to the originally requested page or sets the text property of a label on the form to instruct the user to try again. ASP.NET In ASP, functions can be enclosed in Differences <SCRIPT></SCRIPT> tags, as in the example shown in Listing 5-1, or in <% and %> tags, which are used to enclose code. ASP.NET only supports functions inside script blocks. Currently, the error message that appears if you inadvertently use <%
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and %> tags to enclose function declarations might not clearly describe the problem. You can, however, still use <% and %> tags inline to display results. In any event, as you ll see shortly, there s a better way to code ASP.NET applications. Also note that within the <SCRIPT></SCRIPT> tags the Login_Click function is never directly called. In a moment, I ll explain exactly how this function gets called. Within the body of the page (just inside the <BODY></BODY> tags), a form is started, using a <FORM> start tag. Unlike a traditional ASP or HTML form tag, the only attribute specified here is the runat attribute, set to server. There s no mention of using post or get, and no action attribute to specify the page to be called when the form is submitted. An ASP.NET form that uses a runat=server attribute/value pair always posts back to itself. Although using the runat attribute here isn t something you d do in classic ASP, using the runat attribute for script blocks should be familiar to ASP programmers. ASP.NET supports the runat attribute for many HTML tags, and using runat always implies the same thing that there will be some activity on the server to support this component. The form contains a great deal of standard-looking HTML code, including tables and text box input elements. The text box input elements do have one unfamiliar feature, the same runat=server attribute/value pair that the <FORM> tag uses. ASP.NET Server Controls vs. HTML Server Controls You ll notice some unfamiliar tags contained within Listing 5-1. These tags begin with <ASP:. In some cases, the string after ASP: does look familiar (as in ASP:Button and ASP:Label), and in others, it is unfamiliar (for example, ASP:RequiredFieldValidator). These tags are ASP.NET server controls. These controls run on the server, and in some respects, they behave like the HTML controls we ve seen with the runat=server attribute/value pair. When controls have the runat=server attribute/value pair, they can trigger server-side functions. In this example, the Login_Click method is called when the ASP.NET button server control is clicked. But if these controls are similar, why do both sets exist There are several reasons for having two sets of controls. First, some of the controls don t have pure HTML equivalents. Although creating an HTML server control for an input box or a button by using a standard HTML tag and adding runat=server seems like a natural extension, a control like RequiredFieldValidator requires something different, as it has no pure HTML equivalent. But before we delve into exactly what a RequiredFieldValidator control would do, it s useful to understand the basic differences between the two types of server controls, HTML server controls and ASP.NET server controls. HTML server controls provide the following features: An object model that allows controls to be manipulated programmatically. An event model that allows you to handle events for the controls in a way similar to client-side event handling, except here event handling happens on the server. The ability to handle events on the client side, the server side, or both. It might seem odd to handle events on both the client and the server, but there are good reasons why this might be appropriate and reasonable. I ll supply more information on this feature in 7. Automatic maintenance of values between trips to the server. Enter a value in an HTML text box server control, and after a submit operation, the control can maintain the text that was entered. Interaction with validation controls. We ll look at this feature in more detail in the next section, Using Validator Controls. Data binding to one or more properties of the control. Support for HTML 4.0 style sheets, if the browser supports it. o Pass-through custom attributes. You can add attributes to the HTML server control, and the .NET Framework will read attributes and render them without any change in functionality.
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ASP.NET server controls provide everything that HTML server controls provide and more. However, ASP.NET server controls don t have a one-to-one mapping to standard HTML elements. (For example, the RequiredFieldValidator control has no standard HTML equivalent.) ASP.NET server controls provide the following features: A rich object model that allows for type-safe programming. Automatic browser detection. The controls detect the browser s capabilities and provide client-side code appropriate to the client. For some controls, the ability to modify the look and feel using templates. (C++ programmers, these are not at all what you think of as templates!) For some controls, the ability to specify whether an event for a control should be cached for later form submission or posted immediately to the server. o The ability to pass events to a parent control from a nested control. For example, a button in a table can have an event passed to the containing table. Login.aspx in Listing 5-1 uses both HTML server controls and ASP.NET server controls. Most of the examples in this book use ASP.NET server controls. For programmers used to working in type-safe languages, such as C and C++, using ASP.NET server controls will be more comfortable, as they provide a type-safe object model.
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