สอบถามการใช้ ConnectionString ใน Webconfig ของ Sqlserver ครับ

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
  </system.web>

  <system.webServer>
    <directoryBrowse enabled="true" />
  </system.webServer>

  <connectionStrings>
    <add name="ConnectionString"  providerName="System.Data.SqlClient" connectionString="Server=JUPITER\\SQLEXPRESS;UID=Sa;PASSWORD=1478;Database=Exam;" />

    
  </connectionStrings>
</configuration>