C# Implicit conversion of "someValue" from 'string' to 'StringValues' in Rider

Working with ASP.Net Core in Rider (learning it) and trying to set the Response headers. The headers work great, no problems. But in the Rider it adds some information (as on the image below) with the tip: Implicit conversion of "someValue" from ‘string’ to ‘StringValues’ What does this message mean? Thanks. >Solution : C# has… Read More C# Implicit conversion of "someValue" from 'string' to 'StringValues' in Rider