For those who happen to end up here some time later:

• Net5/6/7/8 got System.Text.Encoding.Latin1 which is "Western European (ISO)"-"iso-8859-1".
• Net4's Codepage1252 (often used as System.Text.Encoding.Default) is "Western European (Windows)"-"iso-8859-1"

Those are not the same. But they are mostly the same. So if you got data encoded as "Western European (Windows) 1252", using Latin1 will probably get better results than Ascii or UTF7/8/16.

Check the wiki article for the difference in special characters.