web_config配置

<configuration>
    <system.web>
      <compilation debug="true" targetFramework="4.5" />
      <httpRuntime targetFramework="4.5" />
    </system.web>
  <appSettings>
     <add key="connectionString" value="server=.;database=数据库名称;UID=用户名;PWD=密码"/>
  </appSettings>
</configuration>