It would be great if LinqPad query can access internal members of referenced libraries without changing the referenced libraries to add InternalsVisibleTo attribute. Instead we could use the reverse attribute IgnoresAccessChecksToAttribute in the query to allow it to access internal members of any specified libraries. You can find detailed information on how this can be done here: https://github.com/aelij/IgnoresAccessChecksToGenerator and https://github.com/filipw/Strathweb.Samples.CSharp.NoVisibilityChecks