Create database login and user using SMO

I am trying to create Login and user programatically  using SMO sql 2008
if the login ( i.e testlogin) already exist  in the database then i want to creat a user(i.e test user) and give read only access and map this login and user ..
if the login is new then create a login and user and give the read only access..
how can i do this programatically using SMO sql 2008?

jung1975Asked:
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