C# control that allow to attach line numbers to rich text box.

/*
 * (C) 2011 Anton Pototsky
 * Based on VB.NET project by nogChoco: http://www.codeproject.com/KB/cpp/linenumbers_for_rtb.aspx
 * Licensed under The Code Project Open License (CPOL): http://www.codeproject.com/info/cpol10.aspx
 */