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Interview Questions and Answers on .Net Framework, OOPS, ASP.Net, C#.Net, SQL Server, WCF Series – Part 20


Question 191 - What are Hidden Frames in ASP.Net?

  • A hidden frame is a frame with 0 width and height, so that no one can see it.
  • You can run programs in there when you need to make a round trip to the server so that your main frame does not refresh.
  • To create one, you just use a frameset tag
  • A hidden frame is a complete document, e.g. IFRAME, that is not visible.

Question 192 - What are the Benefits of Hidden Frames in ASP.Net?

  • Hidden frames allow you to cache more than one data field.
  • The ability to cache and access data items stored in different hidden forms.

Question 193 - What are the Limitations of Hidden Frames in ASP.Net?

  • Not supported by all browsers
  • Stored data is not secured as it is stored on client's machine in the form of hidden fields.

Question 194 - What is a Cookie in ASP.Net?

  • It is a small bit of text that accompanies requests and pages as they go between the server and browser.
  • The cookie contains information the Web application can read whenever the user visits the site.
  • It provide a useful means in Web applications to store user-specific information.
  • Cookies are associated with a Web site, not with a specific page, so the browser and server will exchange cookie information no matter what page the user requests from your site.
  • Most browsers support cookies of up to 4096 bytes.
  • Most browsers allow only 20 cookies per site, so if you try to store more, the old cookies are discarded.
  • Maximum 300 cookies can be stored that will be accepted from all sites combined.

Question 195 - What are the examples of Cookie usage in ASP.Net?

  • Cookies are used for all sorts of purposes, all relating to helping the Web site remember you.
  • For example, a site conducting a poll might use a cookie simply as a Boolean value to indicate whether your browser has already participated in voting so that you don't vote twice.
  • A site that asks you to log on might use a cookie to tell itself that you've already logged on so that you don't have to keep entering your credentials.

Question 196 - What are the Types of Cookies in ASP.Net?

  • Persistent - Means the cookie will be expired as soon as the application is closed
  • Non Persistent - Even the application is closed the data will be remained as per the cookie timeout value.

Question 197 - What are the Benefits of Cookies in ASP.Net?

  • They are simple to use.
  • Light in size, thus occupy less memory.
  • Stores server information on client side
  • Data need not to be sent back to server.
  • Cookies persist for much longer period of time than a session.

Question 198 - What are the Limitations of Cookies in ASP.Net?

  • Since they are stored on the client side in plain text, they are not secure.
  • Number of cookies that can be stored and their size is limited.
  • They don't work if security level is set too high in browser.
  • Some people might just disable cookies on their browsers.

Question 199 - What is the relation between Cookies and Session State?

  • By default, ASP.NET uses a non-persistent cookie to store the session state.
  • If a user has disabled cookies on the browser, Session state cannot use a cookie to store the session ID and Session state doesn't work. - No cookie, No Session state.

Question 200 - What is a Cookieless Session in ASP.Net?

You can configure your application to store Session IDs not in a cookie, but in the URLs of pages in your site. By keeping the Session ID in the URL, ASP.NET stores the ID in the browser, in a manner of speaking, and can get it back when the user requests another page. Cookieless sessions can get around the problem of a browser that refuses cookies and allow you to work with Session state.
However, under some limited circumstances, if the user shares the URL with someone else — perhaps to email the URL to a colleague while the user's session is still active — then both users might end up sharing the same session, with unpredictable results.


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About Author: Karthikeyan Anbarasan, Microsoft MVP (Most Valuable Professional) in ASP.NET/IIS Architecture. He is the Founder and Chief Editor of the www.f5debug.net website and has authored books on Windows Phone and Business Intelligence(SSIS). He is also a Passionate Speaker and a Blogger on Microsoft Technologies.

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