Specifies the maximum and minimum number of characters that are allowed for an entity member. It is always raised before the CellValidated event, which is described in the next section. IsValid - you can use this property to control the commit process. NewValue - the new value that is about to be committed. For the old values, use the OldValues property. ErrorMessage - custom text message used to hint the user about the type of validation error. If the focus is moved to a cell in another row, then both RowValidating and RowValidated are fired, containing the whole row data, including the new and the old values of the edited cells. They do not occur when the RadGridView loads data. You can subscribe to the CellValidating event declaratively or in code-behind like this: Designates the minimum and maximum constraints for the associated member. Denotes that RadGridView will perform validation only in edit mode. Specifies that a value must be provided for a property.
The following Validation Attributes are available: This argument is of type object, but can be cast to the RadGridView type. At this moment, a CellValidating event is fired and since the new value is not committed yet to the underlying data object, here is the perfect place for applying a custom UI validation. RadGridView's appearance after validation An exception of any kind will result in a validation error, and an exception message will appear as an error tooltip. The sender argument contains the RadGridView. This is the validation that is built into the business object implementation. This results in a binding validation error Figure 3 and the GridViewBoundColumnBase editor will enter into an invalid state. Denotes that RadGridView will not perform any validation. It provides you with the possibility to choose what type of validation to apply for each instance of RadGridView. The CellValidated event occurs when the cell has validated the new content. Denotes that RadGridView will perform validation only in edit mode. If the RadGridView is initially loaded with an incorrect value, no error messages will be displayed. Designates the minimum and maximum constraints for the associated member. The parameters passed to the validated event handler are two: Example 3 shows how to validate the OrderNo property of the Order object to be longer than 5 characters. DataContext, Order If [String]. Denotes that RadGridView will perform validation only in view mode. DataContext as Order; if String. Designates a regular expression to be used for validation of the associated member. Only validation through data annotations is respected. Specifies the name of an additional type to associate with an entity member. Specifies the maximum and minimum number of characters that are allowed for an entity member. Row - the committed row to which the cell belongs. IsValid property to False, this will cancel the editing process and will return focus to the invalid GridViewCell. Validation Events Lifecycle It is important to know that each one of the validation events is fired only when the user is trying to commit new data in the RadGridView control. The RowValidating event is very similar to the CellValidating event.
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