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 End-User Documentation

LookUpEditBase.ProcessNewValue Event

Occurs when a new value entered into the edit box is validated.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v17.2.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type ProcessNewValueEventArgs containing data related to this event.

The following ProcessNewValueEventArgs properties provide information specific to this event.
Property Description
DisplayValue Gets or sets the value entered by the end-user.
Handled Gets or sets a value specifying whether the lookup editor must locate the newly inserted record.

Expanded Remarks

The editor's ProcessNewValue event is equivalent to the RepositoryItemLookUpEditBase.ProcessNewValue event available via the Properties object, i.e. adding/removing an event handler for the current event actually affects the RepositoryItemLookUpEditBase.ProcessNewValue event.

Refer to the RepositoryItemLookUpEditBase.ProcessNewValue topic for more information.

Expanded Example

Suppose a lookup editor displays a list of persons in the dropdown window. Dropdown rows are retrieved from a collection of a custom ContactList class. For this purpose, the RepositoryItemLookUpEditBase.DataSource property is set to an instance of the ContactList collection. Each element in the collection represents an object of the Contact class.

The following ProcessNewValue event handler adds new records to the data source. This occurs when the end-user enters a new name in the edit box that does not exist in the dropdown list and presses the Enter key. The entry is added by the Add method implemented in the ContactList class. The ProcessNewValueEventArgs.Handled parameter is set to true in order to force the editor to locate the newly inserted record after the event handler is performed.

Before inserting a new record, a message box is displayed and this allows the user to submit or discard the value. The following message box appears when a 'Jack Cooper' entry is entered:

After pressing the 'Yes' button, the new string is added to the list and the editor picks it up:

Expanded See Also

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