C#应用程序配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 
 
  <connectionStrings>
 
    <add name="server" connectionString="localhost"></add>
    <add name="database" connectionString="housing"></add>
    <add name="login" connectionString="root"></add>
    <add name="password" connectionString="root"></add>
  </connectionStrings>
</configuration>

        private static string server = ConfigurationManager.ConnectionStrings["server"].ConnectionString;
        private static string database = ConfigurationManager.ConnectionStrings["database"].ConnectionString;
        private static string login = ConfigurationManager.ConnectionStrings["login"].ConnectionString;
        private static  string password = ConfigurationManager.ConnectionStrings["password"].ConnectionString;