Design the application architecture - Objective 1.4: Configure state management

Question 1

What 6 places can you store state information in an ASP.Net MVC application?

Answer 1

1. Cache
2. Session
3. Cookies
4. QueryString
5. [Http]Context.Items
6. Profile

Question 2

What is the ASP.Net Cache?

Answer 2

A memory pool store on the server and shared across users

Question 3

What is the ASP.Net Session?

Answer 3

A store on the server that is unique for each user

Question 4

What are cookies?

Answer 4

Strings that are stored locally in the browser’s cache and are sent with each HTTP request to the server

Question 5

What is the QueryString?

Answer 5

The part of the URL after the question mark

Question 6

What is the HttpContext.Items?

Answer 6

A place to store data which is needed only for the lifetime of the request

Question 7

What is ASP.Net profile?

Answer 7

User-specific information stored in a database which persists across multiple sessions

Question 8

What is a major consideration of using ASP.Net Cache in a web farm?

Answer 8

Each server needs its own copy of the Cache since any individual request cannot be guaranteed to be sent to a specific server.

Question 9

Which class must you inherit from to implement a custom session state provider in ASP.Net, for example, one that stores session in an Oracle database,?

Answer 9

SessionStateStoreProviderBase

Question 10

How do you configure IIS to support a custom session state provider?

Answer 10

1. Open IIS Manager and navigate to the web site.
2. In Features View, double-click Session State.
3. On the Session State page, in the Session State Mode Settings area, click Custom.
4. Click Apply in the Actions pane.

Question 11

What are cookies?

Answer 11

Small snippets of information stored on the client side that can persist across sessions and are individualized to a particular domain or subdomain.

Question 12

When are cookies sent to and from a server?

Answer 12

They are sent to and from a server with every request and response.

Question 13

In ASP.Net, which class is used to read incoming cookies on the server?

Answer 13

HttpContext.Request.Cookies

Question 14

In ASP.Net, which class is used to write outgoing cookies on the server?

Answer 14

HttpContext.Response.Cookies

Question 15

What is a query string?

Answer 15

Information passed as part of the URL. The query string part of the URL is any text after the question mark.

Ex:

Given this url - http://www.microsoft.com/?id=20

The query string is id=20.

Question 16

In ASP.Net, which class is used to read the query string sent during a request?

Answer 16

HttpContext.Request.QueryString

Question 17

Why should you not put personal or information that should be secure in the query string?

Answer 17

Query strings/URLs are not encrypted even over SSL.

Question 18

Where is HttpContext.Items most commonly written to?

Answer 18

In HTTP modules, such as during the authentication phase of a request.

Question 19

In ASP.Net, which class is used to read user profile information?

Answer 19

HttpContext.Profile

Question 20

What must be configured in the web.config before ASP.Net user profiles can be used?

Answer 20

A membership and a profile provider

Question 21

What is the maximum size cookies can be?

Answer 21

4 KB

Question 22

What is one advantage of using cookies over HTML5 web storage for maintaining state?

Answer 22

With cookies, no additional code needs to be written since cookies are automatically sent/received during requests.

Question 23

What two JavaScript objects are used to access HTML5 web storage?

Answer 23

sessionStorage and localStorage

Question 24

What is the difference between HTML5 session storage and local storage?

Answer 24

Local storage persists after the browser closes. Session storage persists only while the window or tab is still open.

Question 25

In ASP.Net, how do you determine the capabilities of the current user’s browser?

Answer 25

Access the HttpRequest.Browser property which returns an HttpBrowserCapabilities object.

Question 26

In JavaScript, how do you determine if the browser supports HTML5 web storage?

Answer 26

Test the window object for the presence of the localStorage or sessionStorage properties.

Ex:

if (window.localStorage)
{
window.localStorage.setItem(“MyKey”, “MyValue”);
}

Question 27

In JavaScript, how do you determine if HTML5 web storage has been updated?

Answer 27

Add an event listener for the storage event of the window object.

Ex:

window.addEventListener(“storage”, myEventHandler, true);