You are implementing a Web page that displays text that was typed by a user. You need to display the user input in the Web page so that a cross-site scripting attack will be prevented. What should you do？（）

A.Call document.write.
B.Call Response.Write.
C.Call HttpUtility.UrlEncode.
D.Call HttpUtility.HtmlEncode.

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You are developing a Web page. The user types a credit card number into an input control named cc and clicks a button named submit. The submit button sends the credit card number to the server. A JavaScript library includes a CheckCreditCard function that returns a value of true if the credit card appears to be valid, based on its checksum. You need to ensure that the form cannot be used to submit invalid credit card numbers to the server. What should you do?（）

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You have created an ASP.NET server control named ShoppingCart for use by other developers. Some developers report that the ShoppingCart control does not function properly with ViewState disabled. You want to ensure that all instances of the ShoppingCart control work even if ViewState is disabled. What should you do？（）

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You are implementing an ASP.NET page that hosts a user control named CachedControl. You need to ensure that the content of the user control is cached for 10 seconds and that it is regenerated when fetched after the 10 seconds elapse. Which two actions should you perform？（）

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