数据库链接字符串的两种写法

<connectionStrings>

    <add name="connection" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\MyDatas.mdf;Integrated Security=True;User Instance=True"/>

</connectionStrings>

 string connectionString = ConfigurationManager.ConnectionStrings["connection"].ConnectionString;

 

 

<appSettings>

        <add key="strcon" value="data source=2011-20111005ND;user id=sa;pwd=sa;database=DB_SSSL" />

  </appSettings>

 string connectionString = System.Configuration.ConfigurationManager.AppSettings["strcon"];