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

use Environment.NewLine

sbUser.AppendLine("Please find below confirmation of your registration details. If any of these details are incorrect, please email someone@somewhere.com");
sbUser.AppendLine(Environment.NewLine);
sbUser.AppendLine("Selected event : " + ContentPage.FetchByID(int.Parse(ddlEvent.SelectedValue)).PageTitle); 
sbUser.AppendLine("Date of event : " + thisEvent.EventStartDate.ToString("dd MMM yyyy"));
sbUser.AppendLine("==============================================================");
sbUser.AppendLine(Environment.NewLine);