qlServer2005Winform中的数据库连接字符串一般放入到AppConfig文件中以便于管理

然后在一个类Connection.cs中获取您要读取的数据库连接字符信息：
string ConnectionString;//字符串连接定义
ConnectionStringSettings settings;
settings = ConfigurationManager.ConnectionStrings["DBConnection"];
ConnectionString = settings.ConnectionString;
//或
string ConnectionString
ConnectionString=ConfigurationManger.ConnectionStrings["DBConnection"].ConnectionString;
[说明:]上述要引用using System.Configuration