SQL Server R8 Password issues and 5102 errors

Two ways to sign in:

1. Integrated Login
   Connection: con = new SqlConnection ("server=.\\sqlexpress;database=db_news; Trusted_connection=sspi ");
2. Password Login:
   Server=.; database=db_news;uid=sa;pwd=585858;
   ( where server=.\\sqlexpress, which indicates the version of SQL Server being used is a simplified version)

5102 Error:

Reason: Insufficient permissions, right click on the file, find the Authenticated users user name, give Full Control permissions, while the matching log file will also give Full control permissions.

SQL Server R8 Password issues and 5102 errors