Validating user input in a web forms page

Place four controls from the Web forms section of the Toolbox onto the form. If Is Valid returns a value of true then all of the validation checks were successful.

Drag one Text Box control and give it an ID of First Name Text Box, two Button controls (Submit Button and Cancel Button), and one Required Field Validator (First Name Required Field Validator). The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. The Required Field Validator fails when the value in the associated control matches the value of the Initial Value property of the Required Field Validator.

You could use F12 to check whether the Textbox “txt Name” in the code above is been rendered as below.

Then you could try to create a clean page that just has the Text Box controls to make sure it’s not related to other JS functions.

In many cases, the values you need are some other data types, like integers or dates.

Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.

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.

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.Using two separate codes is not only a resource consuming (time and money) process, it also degrades the performance of applications.In this article we are going to see, how we can reduce the programmers effort on coding, reducing the execution process time and simplify the code handling and less number of lines in the coding. The goal of web form validation is to ensure that the user provided necessary and properly formatted information needed to successfully complete an operation.[Links checked February/10/2017] User’s input can be validated on the server and on the client (web browser).required Attribute, in the “Browser Support” you could see this attribute is supported by IE10 and above.


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