Why does StringBuilder.AppendLine not add a new line with some strings?

Question

I\'m trying to use stringbuilder to create a body of string to be used in a text (not HTML) email. However some lines (where i include dynamic data, a new line is not added,

Answer 1

Windows 10 Insider preview Build 15007. The Default Line Terminator and the Environment.NewLine are both "\n". To use "\r\n" I had to create a string constant and use it instead.