step 1: follow steps given in this link to setting up database on server pc
http://support.microsoft.com/kb/914277[^]
step 2: after step 1 complete then change connection string's parameters,
datasource = server-name OR IP-Address [which is in sharing now after step 1] ; [For ip address cmd > ipconfig -it will show ip address]
Initial catalog = your database name ;
UserId = sql server - user login Id ;
Password = sql server - user login password;
Happy Coding!
:)