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This article should not be construed as the best practices white paper.This article is entirely original, unless specified.Any resemblance to other material is an un-intentional coincidence and should not be misconstrued as malicious, slanderous, or any anything else hereof.Conclusion In this example, we learned how to invoke validate input to Windows Forms controls and display user-friendly informative error messages.
I display the data of the is datagridview in another interface and make the cells read-only. But the thing is when I click on a row that data was added previously and press the Add new row the cell validating event is triggered.The event handler of a non-validating action is also called if the invalid data was already entered.This ensures that the event handler of a non-validating action is called without checking whether the user entries are valid.Code Snippet: Validate all form controls when the Create Appointment button is clicked If the user clicks the Create Appointment button and the data is not valid, error indicators are displayed next to the controls with invalid data.
Validation in Action This article is purely for demonstration.You can also display errors that occur in Data Sets.