ASPxComboBox.AllowNull Property
Gets or sets a value that specifies whether the combo box allows null values to be entered.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v20.2.dll
NuGet Package: DevExpress.Web
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| Boolean | **false** | true, if null values can be entered into the editor, otherwise, false. |
Remarks
If the AllowNull property is set to true, end-users can enter null values into the editor by clearing its text or clicking the ‘Clear’ button. In this case, the editor’s ASPxComboBox.Value property is equal to null.
Note
If the AllowNull property is set to false, the ‘Clear’ button isn’t displayed, and the editor doesn’t accept null values. However, if the ClearButton.DisplayMode property has Always or OnHover values, the ‘Clear’ button will be displayed and an editor’s value can be cleared.
The AllowNull property is not in effect if when the SetValue method is called.