Create relationship between Pages Pro-grammatically using Kentico 8.2 API

Direct from the API Examples:

private bool CreateRelationship()
{
    // Get the relationship name
    RelationshipNameInfo relationshipName = RelationshipNameInfoProvider.GetRelationshipNameInfo("MyNewRelationshipName");
    if (relationshipName != null)
    {
        // Get the tree structure
        TreeProvider tree = new TreeProvider(MembershipContext.AuthenticatedUser);

        // Get documents for relationship (the Root document is used for both in this example) 
        TreeNode root = tree.SelectSingleNode(SiteContext.CurrentSiteName, "/", null, true);

        // Create the relationship between documents
        RelationshipInfoProvider.AddRelationship(root.NodeID, root.NodeID, relationshipName.RelationshipNameId);

        return true;
    }

    return false;
}