Connection string between ADO. NET and SQL Server

Windows integrated security verification:
1. With SQL Server 2005 "Server = SAIXIN-1F662FDD \ saixin; database = blogdb; Integrated Security = sspi"
The server is the SQL server name, not the computer name or local or localhost.

2. Compared with SQL Server 2000"Server = (local); initial catalog = dbtest; Integrated Security = true";

SQL authentication:
1. With SQL Server 2000 for "Data Source = SAIXIN-560259DD; user id = sa; Password = sa; persist Security info = false; initial catalog = nhibalog ;"

2. Connect to sqlexpress

Data Source = localhost \ sqlexpress; initial catalog = my51aspx; user id = sa; Password = lhking