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In this chapter s exercise, you will be expanding on the MyMarquee widget to include new features. This will require you to edit many parts of the code and explore new functions in the API documentation. You should also consider adding your own enhancements to the widget that are not mentioned in the exercise, such as a message-changed signal!

public ActionResult Sign( string name, string email, string comments) { //do something with the values, such as send an email ViewData["name"] = name; ViewData["email"] = email; ViewData["comments"] = comments; return View("ThankYou"); }

In this exercise, expand the MyMarquee with a few new abilities. First, the programmer should be able to specify the scroll direction, whether it is to the left or to the right. Also, place a rectangular border around the widget. The other property, the message, should now be a list of messages that are cycled. The initial message should be able to be set in my_marquee_new(). Also, implement an override function that is called when the mouse enters the proximity of the widget. When this happens, the message should stop scrolling until the mouse cursor leaves the proximity. To do this, you will have to add new event masks to the GdkWindow object.

Keeping software as simple as possible is another way to preserve software security Complex software is likely to have many more bugs and security holes than simple software Code should be written so that it is possible to test each function in isolation One example of a large, complicated piece of software that has had many security holes is the UNIX sendmail program (wwwsendmailorg) The sendmail program is installed on many UNIX servers deployed on the Internet, and its goal is to route mail from a sender to a recipient The simpler the design of a program and the fewer lines of code, the better A simpler design and fewer lines of code can mean less complexity, better understandability, and better auditability That does not mean that you should artificially make code compact and unreadable.

In this action, you can see that the arguments match the names of our form values. This is intentional because the ASP.NET MVC Framework will automatically convert values from posted form values, query string values, and other places. We want to access this data on the view (so that we can present the entry to the user). To do this, we utilize a feature called ViewData. This is a dictionary object (which means you put objects in a data structure that are referenced by a key). Finally, we return a specific view, called ThankYou. You don t necessarily have to choose a view name that matches the action name, but in many cases that s the most desirable course. We ll create this view now (listing 1.7).

Summary

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> ThankYou </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Thank You!</h2> <p>Thank you for signing the guest book! You entered:</p> Name: <%= ViewData["name"] %><br /> Email: <%= ViewData["email"] %><br /> Comments: <i><%= ViewData["comments"] %></i> </asp:Content>

It means that you should avoid unnecessary mechanisms in your code in favor of simplicity In order to keep software simple and security checks localized, you can take advantage of a concept called a choke point A choke point is a centralized piece of code through which control must pass You could, for instance, force all security operations in a piece of software to go through one piece of code For example, you should only have one checkPassword() function in your system all password checks should be centralized, and the code that does the password check should be as small and simple as possible so that it can be easily reviewed for correctness The advantage is that the system is more likely to be secure as long as the code is correct.