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The Format event on a data binding can be used to reformat incoming data to comply with the mask, and the Parse event can be used to reformat outgoing data to comply with the specifications of the data field. If you want full programmatic control over validation, or need to perform complex validation checks, you should use the validation events built into most Windows Forms controls.
Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.
If it is, then we change Is Valid to true, if it is not we change Is Valid to false.
To test this out, simply load up the web site and click the button when the checkbox is not checked.
To demonstrate this we will need to create a simple web page with a checkbox and a button on it. Whenever validation is initiated, our Server Validate event method is executed and checks to see if our checkbox is checked.
However, in certain cases you may want to use validation on a checkbox such as one that would require them to accept the terms and services of a web site or registration process.
Windows Forms provides several ways for you to validate input in your application.
If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.
But, this question comes up repeatedly in my work as a .There are lots of way to validate a check box and here you will find out some of them. Now you have two kinds of Check Box Required Field Validator.When you run the page and click one of the buttons, you will see that the checkbox will have a Required Field Validator. But it works only on serversde, requiring a postback to use it.It allows you to specify required characters, optional characters, literal characters, such as hyphens and parentheses, currency characters, and date separators.The control also works well when bound to a data source.