This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.
For example, you don't want to process a form that's missing critical information.
When users enter values into an HTML form, the values that they enter are strings.
You might also have certain restrictions on the values.The following example shows a page that illustrates these steps. code-cshtml Main] To see how validation works, run this page and deliberately make mistakes.For example, here's what the page looks like if you forget to enter a course name, if you enter an, and if you enter an invalid date: By default, user input is validated after users submit the page — that is, the validation is performed in server code.is a series of six courses where authors solve the same problems using different programming languages. Kevin introduces challenges and provides an overview of his solutions in Ruby.Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.