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The following procedures describe how to apply validation rules to Data Grid bindings and customize the visual feedback.
If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.The other type of input validation can be used to reject any unacceptable data, for example a zero value in a field that must be greater than or equal to one, or an inappropriate string. The example below uses the Column Changing event because the unacceptable value is disallowed for the "Product" column in particular.This is done in the dataset by writing an event handler for the Data Table. You might use the Row Changing event for checking that the value of an "End Date" column is later than the "Start Date" column in the same row.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.
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