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public class HtmlWriter
{
   static Dictionary _colors;
   static int _colorNum;
   static StringBuilder _colorString;

   /// 
   /// 
   /// 
   /// 
   /// 
   public static string GenerateRtf(TextArea textArea)
   {
     _colors = new Dictionary();
     _colorNum = 0;
     _colorString = new StringBuilder();

     StringBuilder htmlBuilder = new StringBuilder();

     htmlBuilder.AppendLine("");
     string fileContent = BuildFileContent(textArea);
     //htmlBuilder.Append(@"\viewkind4\uc1\pard");
     htmlBuilder.Append(fileContent);
     htmlBuilder.AppendLine("");
     return htmlBuilder.ToString();
   }

   static string BuildFileContent(TextArea textArea)
   {
     StringBuilder htmlBuilder = new StringBuilder();
     foreach (ISelection selection in textArea.SelectionManager.SelectionCollection) {
       int selectionOffset = textArea.Document.PositionToOffset(selection.StartPosition);
       int selectionEndOffset = textArea.Document.PositionToOffset(selection.EndPosition);
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