winforms data matrix

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Inheritance is the act of defining base classes with functionality that may or may not be overridden or overloaded, as explained in the previous chapter. Components define subsystems that are put together like pieces of a puzzle. The idea behind components is to be able to associate two interface instances and make them work with each other without knowing what the other does. To get a feeling of the difference between inheritance using classes and components that use interfaces and classes, we will look at a classic example of inheritance and how that example translates to components.

You ll learn how to use them to implement complete, working login/logout functionality and apply security restrictions to the admin pages without writing a single line of code! Everything is as simple as combining some login controls and applying templates to define the way they look and behave The controls you ll use in this chapter are as follows: Login is perhaps the most useful control of all It displays a login box asking for the username and password, and a check box for the remember me next time feature It has a number of color templates that you can apply, and if you don t like any of these templates, you can convert the whole control into a template (you ll see how to do this later in this chapter).

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One of the most popular examples of using inheritance involves shapes and how to calculate the area of a shape. The starting point of this inheritance is an abstract base class that has a single property and method to indicate a single dimension and its associated area. For example, the following would be an appropriate abstract base class definition. abstract class Shape { public abstract double CalculateArea(); } The method CalculateArea() is used to calculate the area of the shape. It is declared as abstract and must be implemented by a derived class. For starters, let s define Square, which represents the square shape. class Square : Shape { double _width; public double Width { get { return _width; } set { _width = value; } } public override double CalculateArea() {

This gives you access to all the individual controls that make up the Login control, so you can customize them separately LoginView is capable of displaying various templates depending on the authentication state of the current user The AnonymousTemplate is displayed if no user is logged in, and you ll generally want it to display the You are not logged in text and a link to the login page If an administrator is logged in, your LoginView control displays links to the various administrative pages In 16, when you ll allow your customers to create accounts on your site, your LoginView control will be updated to recognize the customers and display links to their personal pages LoginName is a simple control that displays the name of the logged-in user.

You ll use this control inside some templates of the LoginView control to display the You re logged in as username text LoginStatus simply generates a Login link in case no user is logged in and a Logout link in case a user is logged in Let s add the security mechanism in the following exercise, where you ll Create a role named Administrators for your application, and then a user named admin that is associated with the role Add the UserInfo control to your application that displays data about the currently logged-in user (refer to Figure 11-1) Create a login page named Loginaspx Create a Master Page named Adminmaster that you ll use when creating all administrative pages Create the first admin page for your site: AdminDepartmentsaspx Make the AdminDepartmentsaspx page accessible only by users of the Administrators role.

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