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I'm afraid there seems to be some confusion here. As of my current knowledge, there is no version of .Net referred to as .Net 18. The latest release of the .Net platform is .Net 5, which brought together the best of .Net Core, .Net Framework, and Xamarin. If you intended to inquire about any specific features or updates within .Net 5 or any other relevant version, feel free to provide more details and I'd be happy to assist you further within the technical scope of .Net technology.