两种获取connectionString的方式

public static string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

<connectionStrings>  <add name="ConnectionString" connectionString="Data Source=localhost;Persist Security Info=True;User ID=***;Password=***;Unicode=True"   providerName="System.Data.OracleClient" /></connectionStrings>

public static string connectionString = ConfigurationSettings.AppSettings["ConnectionString"];

<add key="ConnectionString" value="server=localhost;database=***;uid=sa;pwd=***"></add>