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This procedure shows you how to read the fields and display the user input on the page.(In a production application, you generally do more interesting things with user input.You can use something like: using System; using System. a user writing "asdf" in the zip-code field and so on. e-mail adresses, the syntax is so complex though, that it doesnt provide much benefit to validate it using a regex. Would you like to answer one of these unanswered questions instead?
You ask them to fill in a field, and they forget to, or you ask them to enter the number of employees and they type a name instead.
To make sure that a form has been filled in correctly before you process it, you validate the user's input.
If you don't, a user can try to get your web page to run a malicious script or do something else that compromises your site security or that's just not what you intend.
(This is particularly important if you take user input, store it someplace, and then display it later — for example, as a blog comment, user review, or something like that.) To help prevent these problems, ASP.