asp.net web 开发中配置web.config

1、配置数据库链接字符串

 <connectionStrings>
    <add name="CaoLPractise" connectionString="server=.;uid=sa;pwd=123456;database=CaoL.TJ.TreeShow"/>
  </connectionStrings>

　　

 string conString = ConfigurationManager.ConnectionStrings["CaoLPractise"].ConnectionString;