Add Method
The Add method of the SPPermissionCollection class creates a permission object with the specified member and permissions in the collection.
Parameters
member A Microsoft.SharePoint.Member object that represents the member.
permissionMask A Microsoft.SharePoint.SPRights value that specifies the permissions.
Example
The following code example modifies the permissions of a cross-site group for the Announcements list of the current site.
This example requires using directives (Imports in Visual Basic) for both the Microsoft.SharePoint and Microsoft.SharePoint.WebControls namespaces.
Requirements
Platforms: Microsoft Windows Server 2003
Security: Code Access Security