Some general stuff to get you started:
Use capicom. If you don't have the dlls, you should be able to find it on
the microsoft site.
It's com, so you'll be able to import it into a .NET wrapper
Create a Capicom.Store object.
To open a store of certificates:
call the Open method of the Capicom.Store object
user = CAPICOM_CURRENT_USER_STORE,
store name = "my"
open mode = CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED |
CAPICOM_STORE_OPEN_EXISTING_ONLY
To list the certificates of an open store:
do a for each on the Certificates property (Collection of certificate
objects) of the object returned from the open method
The certificate object can be inspected by using the GetInfo method on a
Certificate object
parameter = CAPICOM_CERT_INFO_SUBJECT_SIMPLE_NAME will get its unique name
To import a certificate:
call the Load method of the object returned from the open method
storage type = CAPICOM_KEY_STORAGE_USER_PROTECTED
To remove a certificate
call the Remove method of the object returned from the open method
the remove method expects the subject simple name of the certificate
hope this helps