Form regions are represented by the FormRegionControl and ImportedFormRegion classes. When you add an Outlook Form Region item to an Outlook add-in project, Visual Studio Tools for Office adds a class to the project that inherits from one of these two classes.

If you import a form region into an Outlook add-in project by using the New Outlook Form Region wizard, Visual Studio Tools for Office creates a form region class that inherits from ImportedFormRegion.

If you select Design a new form region on the first page of the New Outlook Form Region wizard, Visual Studio Tools for Office adds a form region class that inherits from FormRegionControl.

In both cases, Visual Studio Tools for Office adds a form region factory class to the project that implements the IFormRegionFactory interface. The form region factory class is responsible for creating new instances of the form region.

The Microsoft.Office.Tools.Outlook namespace also contains classes and attributes that represent the type of form region, the unique name of the form region, the properties that define how the form region appears in Outlook, and the message class names of Outlook items with which the form region is associated.

 Classes

	Class	Description
	ControlNotFoundException	Represents errors that occur when a control is not found in the Microsoft.Vbe.Interop.Forms.UserForm of an imported form region.
	FormRegionControl	Represents an Outlook form region that is based on a user control.
	FormRegionCustomAction	Represents a custom action that appears in the Custom Actions group on the Ribbon of an Outlook item.
	FormRegionCustomActionCollection	Represents a collection of FormRegionCustomAction objects.
	FormRegionInitializingEventArgs	Provides data for the FormRegionInitializing event of the form region factory class.
	FormRegionKindConstants	Contains constants that specify whether the form region that a form region factory creates is based on a user control or an Outlook Form Storage (.ofs) file.
	FormRegionManifest	Represents a form region manifest that describes how the form region appears in Outlook.
	FormRegionManifestIcons	Represents a collection of icons that appear for separate, replace, and replace-all form regions.
	FormRegionMessageClassAttribute	Represents an attribute that specifies the name of a Microsoft Office Outlook message class to associate with the form region.
	FormRegionNameAttribute	Represents the name that uniquely identifies a form region across all Outlook add-ins.
	FormRegionReadOnlyCollection	Represents a collection of form regions that are associated with a Microsoft Office Outlook add-in.
	FormRegionStorageNullException	Represents an error that occurs when the GetFormRegionStorage method of the form region factory class returns nullNothingnullptra null reference (Nothing in Visual Basic).
	ImportedFormRegion	Represents a Microsoft Office Outlook form region that is based on an Outlook Form Storage (*.ofs) file.
	InvalidMessageClassException	Represents errors that occur when a specified message class name is not valid.
	OutlookAddIn	Represents a Microsoft Office Outlook add-in.

 Interfaces

	Interface	Description
	IFormRegion	Defines an interface that exposes methods that are used by the events of the form region.
	IFormRegionFactory	Defines an interface that creates instances of classes that implement IFormRegion.

 Enumerations

	Enumeration	Description
	FormRegionCustomActionAddressLike	Specifies how to address the target item that appears when the user executes the custom action.
	FormRegionCustomActionBody	Specifies how the Message or Notes field of an Outlook item is included to the reply that appears when the user executes the custom action.
	FormRegionCustomActionMethod	Specifies how to respond when the user executes the custom action.
	FormRegionType	Specifies the way the form region appears in Microsoft Office Outlook.

 See Also

Reference

Other Resources

Creating Outlook Form Regions

Accessing a Form Region at Run Time

Guidelines for Creating Outlook Form Regions

Walkthrough: Designing an Outlook Form Region

How to: Add a Form Region to an Outlook Add-in Project

Custom Actions in Outlook Form Regions

Associating a Form Region with an Outlook Message Class

Walkthrough: Importing a Form Region That Is Designed in Outlook

How to: Prevent Outlook from Displaying a Form Region

How to: Access the Outlook Item that Displays the Form Region