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The Data Grid View class provides a convenient way to perform validation before data is committed to the data store.

You can validate data by handling the Cell Validating event, which is raised by the Data Grid View when the current cell changes.

There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.

One of the features of HTML5 is the ability to validate most user data without relying on scripts.However, this doesn't disable support for the constraint validation API nor the application of the CSS pseudo-class or other As you can see, the HTML is almost the same; we just removed the HTML validation features.Note that ARIA is an independent specification that's not specifically related to HTML5.Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus.

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