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You can prevent validation when a button control is clicked by setting the Causes Validation property to false.The syntax for creating a Validation server control is: In the following example we declare one Text Box control, one Button control, and one Range Validator control in an file.Note: All HTML server controls must be within a Web server controls are special ASP. Like HTML server controls, Web server controls are also created on the server and they require a runat="server" attribute to work.However, Web server controls do not necessarily map to any existing HTML elements and they may represent more complex elements.This is most secure form but comes at cost of performance. NET introduced smart validation server controls to implement page level validations. Usually, Validation is invoked in response to user actions like clicking submit button or entering data.They are capable of performing both server side and client side validations. It also added new features like Validation groups and new Java Script capabilities. Suppose, you wish to perform validation on page when user clicks submit button.

We can understand validation under two categories: Client side validation and Server side validation.

In this function all client side validations can be done.

And when all the validation checks are met, then the function merely returns true to post the page back to the server.

So, Validation server controls offer the combined power of both approaches such that the security of application is never compromised. To make this happen, simply set the Cause Validation property to True for submit button as shown below The Required Field Validator control is simple validation control which checks to see if the data is entered for the attached control.

You can have a Required Field Validator control for each form element on which you wish to enforce Mandatory Field rule.

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