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Question 19   What are benefits and limitation of using viewstate

Advantages

they are stored on a hidden field at client side. no server resources are required to store viewstate
almost all browsers support hidden fields so cross browser compatibility
very easy to implement. no coding is required to restore the values after postback

disadvantages

large viewstate will increase the page size. this may affect page response time.
even though they are hashed, viewstate can be tampered. this can create a potential security issue.
viewstates are by default available within the same page itself.



Question 20   What are benefits and limitations of using hidden frames

Advantages

we can access data stored on different hidden frames
more than one data field can be cached in a hidden frame

disadvantages

not all browsers support hidden frames
hidden frame data can be tampered. this can create a potential security issue.




Question 21   What are benefits and limitations of using cookies

Advantages

cookies are stored at the client side, so no server resources are required.
persistent cookies will be alive even after the user closes the browser.

disadvantages

cookies can be disabled at the browser.
cookies can be tampered. this can create a potential security issue.
large information cannot be stored on cookies since they have a size limit



Question 22   What is query string

A query string is a set of parameters passed along with the url to the web server. a query string stats with ? character and multiples values are passed using & character. a typical example of query string is given below

url?topicid=2&questid=10



Question 23   What is the maximum length of querystring

They are based on browser. maximum length supported by internet explorer is 2048. tested results are saying that firefox, opera and netscape support more than 10000 characters



Question 24   What are benefits and limitations of query string

Advantages

very simple and easy to implement
no server resources are required
supported by all browsers

disadvantages

some browsers have a limit on maximum length supported
querystings can be easily tampered




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