Canceling this event prevents the user from exiting the cell until a valid value is entered or the edit process is canceled (via Esc key).The Data Bound Item will be updated only if the cell is validated.When the validation fails, the editor is closed, but the user cannot change the current row in the grid until a valid cell value is entered.In this situation the editor is not kept active when the validation fails and pressing the Esc key does not revert the changes as the editor is already closed.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.It has the initial "look and feel" of an Excel spreadsheet.provides a convenient way to realize data validation before it is committed to the underlying data source.
At this point the user is not allowed to cancel the performed changes, pressing the Esc key.
The Data Grid View is a very powerful windows form control for providing a user interface to tabular data.
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.
However, the user may prefer to validate all the data cells in a row at once.
This scenario can be achieved by using the Row Validating event, which is fired when the user tries to change the current row (changing to another row or when the control loses focus).