SPSequence class

Provides an abstract superclass for all upgrade sequences in Microsoft SharePoint Foundation.

Namespace:  Microsoft.SharePoint.Upgrade
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

[SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel = true)]
[SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel = true)]
public abstract class SPSequence : SPDelegate, 
	IUpgrader, IHierarchyBuilder, IVersionCompatibleUpgrader

Each concrete sequence is designed to upgrade a specific object type in the server farm. Each object must be marked with the upgradable attribute.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.