Validation is important part of any web application.
User's input must always be validated before sending across different layers of the application.
Below is my code: This works, but the caveat is that this allows dates that may be out of range of SQL dates less than 1753 or you may have a date range (no future date entries).
This does work, but Chris Van Opstal's may be needed for SQL date edits.
Net Validators like Required Field Validator Here Mudassar Ahmed Khan has explained with example how to use ASP. In this example I will validate Text Box data and make sure that the entered text is strictly numeric i.e. Net Custom Validator and its On Server Validate Server Side Event.
This is the simplest way to validate a dd/MM/yyyy date format string.
And it does work brilliantly except the fact that it cannot validate for months which have less than 31 days for example 30/02/2014 will be considered as a valid date. Net Regular Expression Validator samples to validate Minimum and Maximum text Length and also different configurations like Alphanumeric with special characters, Alphanumeric, Alpha and Numeric configurations.
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.Here Mudassar Ahmed Khan has explained how to validate Check Boxes inside Grid View and perform at least one checked validation using Java Script in ASP. Validation of Check Boxes inside Grid View is performed using ASP.