text: <?xml version="1.0" encoding="utf-8" ?>
  <configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
    <appSettings xdt:Transform="InsertIfMissing">
    </appSettings>
  
    <appSettings>
      <add key="aspnet:RoslynCompilerLocation" xdt:Transform="Remove" xdt:Locator="Match(key)" />
      <add key="aspnet:RoslynCompilerLocation" value="roslyn" xdt:Transform="Insert" />
    </appSettings>
  
    <!-- If system.codedom tag is absent -->
    <system.codedom xdt:Transform="InsertIfMissing">
    </system.codedom>
  
    <!-- If compilers tag is absent -->
    <system.codedom>
      <compilers xdt:Transform="InsertIfMissing">
      </compilers>
    </system.codedom>
  
    <!-- If a .cs compiler is already present, the existing entry needs to be removed before inserting the new entry -->
    <system.codedom>
      <compilers>
        <compiler
          extension=".cs"
          xdt:Transform="Remove"
          xdt:Locator="Match(extension)" />
      </compilers>
    </system.codedom>
  
    <!-- Inserting the new compiler -->
    <system.codedom>
      <compilers>
        <compiler
          language="c#;cs;csharp"
          extension=".cs"
          type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
          warningLevel="4"
          compilerOptions="/langversion:default /nowarn:1659;1699;1701"
          xdt:Transform="Insert" />
      </compilers>
    </system.codedom>
  
    <!-- If a .vb compiler is already present, the existing entry needs to be removed before inserting the new entry -->
    <system.codedom>
      <compilers>
        <compiler
          extension=".vb"
          xdt:Transform="Remove"
          xdt:Locator="Match(extension)" />
      </compilers>
    </system.codedom>
  
    <!-- Inserting the new compiler -->
    <system.codedom>
      <compilers>
        <compiler
          language="vb;vbs;visualbasic;vbscript"
          extension=".vb"
          type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
          warningLevel="4"
          compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+"
          xdt:Transform="Insert" />
      </compilers>
    </system.codedom>
  </configuration>