>You can use any of these variations (the second is probably what you need in this instance):

>sb.AppendLine();
>sb.AppendFormat("Hello {0}, {1}" + Environment.NewLine, "Fred", "Bill");
>sb.AppendFormat("Hello {0}, {1}\r\n", "Fred", "Bill");
>sb.Append("Another Line" +Environment.NewLine);
>sb.AppendLine("And another");

>If you want to see what they really look like in the debugger use the 'Text Visualizer' option in a Watch window

I'll leave the code as is now, but I agree that the second variation is easier to read.