winforms qr code

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When you are sitting at the table, you expect a waiter to take your order, serve your food, remove the used dishes, and give you the bill All of these actions are ideas used to run a restaurant that serves a clientele You make use of the idea, as do millions of other clients The idea is applied across all restaurants Think about this a bit The idea is a waiter, but the implementation is a human When you sit down, your waiter may introduce himself by his name, but do you ever use the name Most people don t, because they think of the waiter as a human that takes their order, serves their food, and so on The point is that the human is the implementation, but you really only care about a waiter fulfilling the scope of the task.

The username and password combinations can be saved in various formats and can be physically stored in different places. ASP.NET stores the passwords in hashed form by default.

For example, while you might be sympathetic that your waiter is having a bad day, you want him to be chipper and happy, and to do his job of taking your order, serving your food, and so on Bluntly put, you probably would not care if the waiter s puppy had been run over by a truck This is exactly what interfaces and implementations are about The interface defines a role of tasks that an implementation is supposed to implement You don t care if the implementation.

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Hashing is a common method for storing passwords. The hash value of a password is calculated by applying a mathematical function (hash algorithm) to it. When the user tries to authenticate, the password is hashed, and the resulting hash value is compared to the hash value of the original (correct) password. If the two values are identical, then the entered password is correct. The essential property about the hash algorithm is that, theoretically, you cannot obtain the original password from its hash value (the algorithm is one way).

is capable of doing more, or if the implementation is having a bad day. All you care about is that the implementation does what the interface says it should do. What you have is a decoupling of the idea from the interface, just like at the restaurant, where you don t care if Tom, Dick, Mary, or Jane is your server. In fact, would you care if the human waiter was replaced by a robot Probably not, because what you really care about is eating the food. This is an important aspect of interfaces and implementations, in that implementations are replaceable, and you want to be able to swap one implementation for another. When you use interfaces and types that implement interfaces, you are writing componentoriented software. Components and inheritance are two different object-oriented techniques. You use inheritance to implement interfaces, but components serve the purpose of making ideas happen.

User passwords are stored in hashed form, so when the user tries to authenticate, the entered password is hashed, and the resulting hash value is compared to the hash value of the original (correct) password If the two values are identical, then the entered password is the correct one ASPNET has built-in support for storing user passwords directly in webconfig, or in a special database structure that we ll conveniently call the membership data structure The name comes from ASPNET s membership system, which refers to the ASPNET system for user account management, login and user registration controls, and so on One part of this system is made up of the login controls offered by ASPNET, which you can find on the Login tab of the Visual Web Developer toolbox.

The following are the main scenarios in which Solver won t run, stops before it finds a solution, or reaches a solution that doesn t seem correct to you: You cannot run Solver because of a problem when you choose Tools Solver. You cannot have Solver begin finding a solution because there is a problem with a specific Solver dialog box setting. Once you start Solver, it cannot find a solution because it has reached some predefined limit in the model, or there is simply no possible solution to the problem. Solver finds a solution that you discover is incorrect, because you defined the problem incorrectly. This section describes how to troubleshoot these main scenarios.

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