Create a subsite programmatically

STEP 1: Create subsite programmatically

First I set a few constants:

LOCALE_ID : in my case it had to be Dutch.
SITE_NAME: the url of the site
SITE_TEMPLATE: Choose what kind of site you want to make from the table below.

Available site templates	Site Template Names
Team Site	STS#0
Blank Site	STS#1
Document Workspace	STS#2
Blog	BLOG#0
Group Work Site	SGS#0
Visio Process Repository	VISPRUS#0
Basic Meeting Workspace	MPS#0
Blank Meeting Workspace	MPS#1
Decision Meeting Workspace	MPS#2
Social Meeting Workspace	MPS#3
Multipage Meeting Workspace	MPS#4
Assets Web Database	ACCSRV#1
Charitable Contributions Web Database	ACCSRV#3
Contacts Web Database	ACCSRV#41
Issues Web Database	ACCSRV#6
Projects Web Database	ACCSRV#5
Document Center	BDR#0
Records Center	OFFILE#1
Business Intelligence Center	BICenterSite#0
My Site Host	SPSMSITEHOST#0
Personalization Site	SPSMSITE#0
Enterprise Search Center	SRCHCEN#0
Basic Search Center	SRCHCENTERLITE#0
FAST Search Center	SRCHCENTERFAST#0
Enterprise Wiki	ENTERWIKI#0
Publishing Portal	BLANKINTERNETCONTAINER#0
Publishing Site	CMSPUBLISHING#0
Publishing Site With Workflow	BLANKINTERNET#2

Next I made a feature and added a feature event handler. This is what I wrote in FeatureActivated.

And to make it really clean and tidy, I deleted the subsite when the feature is being deactivated.