SQL 常用连接字符串
Standard Security:
使用 SQL Server 身份验证：

"Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"
   - or -
"Server=Aron1;Database=pubs;User ID=sa;Password=asdasd;Trusted_Connection=False"

Trusted Connection:
使用 Windows 身份验证（信任连接）：

"Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"
   - or -
"Server=Aron1;Database=pubs;Trusted_Connection=True;"

Connect via an IP address:
"Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

Enabling MARS (multiple active result sets):
仅仅支持 ADO.NET2.0

"Server=Aron1;Database=pubs;Trusted_Connection=True;MultipleActiveResultSets=true"

    Note! Use ADO.NET 2.0 for MARS functionality. MARS is not supported in ADO.NET 1.0 nor ADO.NET 1.1
    Streamline your Data Connections by Moving to MARS, by Laurence Moroney, DevX.com >>

Attach a database file on connect to a local SQL Server Express instance:

"Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"
   - or -
"Server=.\SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"
   (use |DataDirectory| when your database file resides in the data directory)
   
            Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).

Using "User Instance" on a local SQL Server Express instance:

"Data Source=.\SQLExpress;integrated security=true;attachdbfilename=|DataDirectory|\mydb.mdf;user instance=true;"

        The "User Instance" functionality creates a new SQL Server instance on the fly during connect. This works only on a local SQL Server 2005 instance and only when connecting using windows authentication over local named pipes. The purpose is to be able to create a full rights SQL Server instance to a user with limited administrative rights on the computer. To enable the functionality: sp_configure 'user instances enabled','1' (0 to disable)

        Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)

如果要进行同步/异步访问需要在字符串后面继续添加 Asynchronous Processing=true 默认关闭

如果要开启 MARS 则加上 MultipleActiveResultSets=True 默认开启。