Validation is important part of any web application.
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.
In this control we can validate and compare two input variables based on their data type using the comparison operators like equal to, not equal to, greater than, les than etc.
Validation controls are used to: Client side validation is good but we have to be dependent on browser and scripting language support. NET Web pages for user input is to be able to check that the information users enter is valid. NET provides a set of validation controls that provide an easy-to-use but powerful way to check for errors and, if necessary, display messages to the user. NETUsually, Validation is invoked in response to user actions like clicking submit button or entering data.
Client side validation is considered convenient for users as they get instant feedback. Suppose, you wish to perform validation on page when user clicks submit button. To make this happen, simply set the Cause Validation property to true for submit button as shown below: Lets understand validation controls one by one with practical demonstration: Required Field Validation Control The Required Field Validator control is simple validation control, which checks to see if the data is entered for the input control.
A servlet is a Java class that runs in an "application server" and sends web pages back to a browser when a user somewhere in the world clicks on a URL.