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    How to: Add a Search Action to Lookup Property Editors and Link Pop-up Windows
    How to: Add the Analyze Action to List Views
    How to: Create an Action Using the Action Attribute
    How to: Customize Action Controls
    How to: Customize the Export Action Behavior
    How to: Customize the New Action's Items List
    How to: Deactivate (Hide) an Action in Code
    How to: Disable an Action When the Current View Has Unsaved Changes
    How to: Hide the Edit Action Column from a ListView in an ASP.NET Application
    How to: Initialize an Object Created Using the New Action
    How to: Limit the Amount of Objects Created using the New Action
    How to: Make the FullTextSearch Action Search Within Required Properties
    How to: Reorder an Action Container's Actions Collection
    How to: Replace a List View's Default Action
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How to: Limit the Amount of Objects Created using the New Action

In this topic, you will learn how to limit the number of objects that an end-user can create using the New Action. Assume you are using the Task business class from the Business Class Library. When creating a new Task via the New Action, the count of existing Task objects will be checked and an end-user will not be allowed to create additional objects if there are already three objects.

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A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=E239.

To access the Task List View when the New Action is about to create a new object, handle the NewObjectViewController.ObjectCreating event of the NewObjectViewController, which contains the New Action. To do this, implement a new View Controller and override the OnActivated method in the following manner.

Note

You can disable an Action instead of interrupting its execution. See the How to: Disable an Action When the Current View Has Unsaved Changes example.

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