sqlserver2008连接字符串

标准连接：

string str="Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;";

信任连接:

string str="Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;";

连接服务器某个实例

string str="Server=myServerName\myInstanceName;Database=myDataBase;

User Id=myUsername;Password=myPassword;";

 附加一个文件到sqlsever express实例

string str="Server=.\SQLExpress;AttachDbFilename=C:\MyFolder\MyDataFile.mdf;

Database=dbname;Trusted_Connection=Yes;";

具体的参考：

http://www.connectionstrings.com