Web.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <connectionStrings configSource="Configuration\ConnectionStrings.config"></connectionStrings>

  <system.web>

    <compilation debug="true">
      <assemblies>
        <add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />
      </assemblies>
    </compilation>

    <pages pageBaseType="OnTopic.Web.TopicPage">
      <namespaces>
        <add namespace="OnTopic" />
        <add namespace="OnTopic.Attributes" />
        <add namespace="OnTopic.Collections" />
        <add namespace="OnTopic.Web" />
      </namespaces>
    </pages>

  </system.web>

  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
    </compilers>
  </system.codedom>

</configuration>