Advanced ASPX GridView Pagination and Data Entities

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <appSettings>
    <add key="GridPageSize" value="12"/>
  </appSettings>
  <connectionStrings>
    <!-- The connection string with Integrated Security (should be used for DB on local computer).-->
    <add name="RaGridViewEntities" connectionString="metadata=res://*/DataModel.csdl|res://*/DataModel.ssdl|res://*/DataModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=RAUL\SQLEXPRESS2005;Initial Catalog=RaGridView;Integrated Security=True;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient"/>
    
    <!-- The connection string with User and Password (should be used for DB on a LAN server). -->
    <!--<add name="RaGridViewEntities" connectionString="metadata=res://*/DataModel.csdl|res://*/DataModel.ssdl|res://*/DataModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=RAUL\SQLEXPRESS2005;Initial Catalog=RaGridView;User ID=RaGridViewUser;Password=RaGridView1!;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient"/>-->
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
    </compilation>
    <authentication mode="Windows"/>
    <authorization>
      <allow users="*"/>
    </authorization>
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>