Understand State Information in Web Applications - myBay
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Understand State Information in Web Applications - myBay
98-363 Web Development Fundamentals. LESSON 1.3. Lesson Overview. How
does ASP.NET state management work? In this lesson, you will review these ...
LESSON
1.3
98-363 Web Development Fundamentals
Understand State Information in Web Applications
LESSON
1.3
98-363 Web Development Fundamentals
Lesson Overview How does ASP.NET state management work? In this lesson, you will review these ASP.NET terms: •
View state
•
Control state
•
Application state
•
Session state
LESSON
1.3
98-363 Web Development Fundamentals
Guiding Questions 1.
How does the ASP.NET Framework help with state management control?
2.
What data types can be stored in view state?
3.
What are hidden fields, and how are they used?
4.
What are cookies?
LESSON
1.3
98-363 Web Development Fundamentals
Questions to help you determine what state to choose:
How much information do you need to store?
Does the client accept persistent or in-memory cookies?
Do you want to store the information on the client or on the server?
Is the information sensitive?
What performance and bandwidth criteria do you have for your application?
What are the capabilities of the browsers and devices that you are targeting?
Do you need to store information per user?
How long do you need to store the information?
Do you have a Web farm (multiple servers), a Web garden (multiple processes on one machine), or a single process that serves the application?
LESSON
1.3
98-363 Web Development Fundamentals
How does the ASP.NET Framework help with state management control?
ASP.NET provides state management facility at four levels: application, session, page, and request.
ASP.NET helps with state management control by maintaining state and page information over multiple requests for the same or different pages.
Application state is a data repository available to all classes in an ASP.NET application. Application state is stored in memory on the server and is faster than storing and retrieving information in a database.
LESSON
1.3
98-363 Web Development Fundamentals
How the ASP.NET Framework helps with state management control (continued)
Control state persists control information that must be retained between postbacks, even if view state is disabled for the page or for a control. Control state is stored in one or more hidden fields. This can include information such as items added to a shopping cart.
Session state enables you to store and retrieve values for a user as the user navigates ASP.NET pages in a Web application.
View state is used to preserve page and control values between client and server. It provides state information. Note: this only provides state information for a specific ASP.NET page.
LESSON
1.3
98-363 Web Development Fundamentals
What data types can be stored in view state?
Data is stored in hidden fields and can contain: y — Strings y — Integers y — Boolean values y — Array objects y — ArrayList objects y — Hash tables y — Custom type converters y (Note: you can store other types of data as well, but the class must be compiled with the Serializable attribute so that its values can be serialized for view state.)
LESSON
1.3
98-363 Web Development Fundamentals
What are cookies?
A cookie is a small bit of text that accompanies requests and pages as they go between the Web server and browser. The cookie contains information the Web application can read whenever the user visits the site. y Cookies will persist beyond the current session, which allows the application to save information for future sessions. Cookies are convenient because they prevent the user from having to retype information on subsequent visits. However, there are privacy issues surrounding their use.
LESSON
1.3
98-363 Web Development Fundamentals
Assignment
Complete the student assignment. Students can work with others to help solve problems, but everyone must complete his or her own assignment.
LESSON
1.3
98-363 Web Development Fundamentals
Lesson Review y
Discuss situations where you would use each state and why.
y
One of the most used forms of state is session state. Why?