LAN connectivity on Desktop application in c#

Question

I have developed an desktop application in C# and sql server 2008
now i want my application to be access by more than one user at the same time access database.
Idea is , databse should be on 1 PC (server) and application will be installed on other PCs (clients ) 
all connected in a LAN.
now i want all user from different PCs(clients) can access the DB (on SERVER) and perform CRUD operations.
my conn, cnf file has coonection string 
server=.\SQLEXPRESS;Initial Catalog=Database1med;Trusted_Connection=Yes;\

I dont know steps to do this . please help to achieve the idea in implementation .thanks