app.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <configSections>
        <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
            <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
            <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <system.web.webPages.razor>
        <host factoryType="System.Web.WebPages.Razor.Test.TestRazorHostFactory, System.Web.WebPages.Razor.Test" />
        <pages pageBaseType="System.Web.WebPages.Razor.Test.TestPageBase, System.Web.WebPages.Razor.Test">
            <namespaces>
                <add namespace="System.IO.Packaging" />
                <clear />
                <add namespace="System.Security" />
                <add namespace="System.Text.RegularExpressions" />
                <remove namespace="System.Security" />
            </namespaces>
        </pages>
    </system.web.webPages.razor>
</configuration>