Note that only the Cell Validating event can keep the editor active,when the validation fails and it does not allow the user to exit the cell until a valid value is filled.
However, pressing the Esc key in this situation will revert the initial value of the cell and it will close the editor. The Row Validating event has a slightly different behavior.
I'm assuming it should fire every time I tab away from a cell in the grid.Lets say the user its not required to enter data in all the rows of the datagridview, the latter approach would work just fine.On the other hand, if the user is required to enter data in all the rows and the validation is simple; the first approach is convenient.This funtionality can be easily implemented by handling the Preview Key Down event, which will revert the row changes after pressing the Esc key.Let's assume that the If the user enters empty string for a specific cell and tries to navigate to another row, the validation fails and the Error Text is displayed on the corresponding row.At this point the user is not allowed to cancel the performed changes, pressing the Esc key. How to efectively validate data entry inside a Data Grid View. Late Validation: This validation is performed after the user is done entering data.provides a convenient way to realize data validation before it is committed to the underlying data source.SOLUTION To achieve data validation prior the row is committed, you can handle the Cell Validating event, which is raised by the control when the current cell changes or when it goes out of edit mode.The SDK Samples Browser is an application that automatically connects to Git Hub and downloads the XAML SDK repository locally to a location that could be set by the user.After download is complete, the application gives a very convenient navigation between all the available examples and a search functionality that doesn’t simply search by control’s names but also through the example’s names and descriptions.