Rules to Better Connection Strings

• Do you know how to make connection strings among different environment?
• Do you use Windows Integrated Authentication connection string in web.config?
• Do you avoid using duplicate connection string in web.config?
• Do you avoid putting connection strings in Business module?
• Do you avoid using non strongly typed connection strings?
• Do you add the Application Name in the SQL Server connection string?
• Do you know the best place to place the connection string?