How to convert rtf to HTML

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C#

How do I convert rtf to html with out losing gap between the lines?
Below is my code. but this will remove extragap between the lines.

before convert
-----
Hi,

How are you?

Thannks
-------
after converting

Hi,
How are you?
Thannks




private const string FlowDocumentFormat = "<flowdocument>{0}";

public static string ConvertRtfToHtml(string rtfText)
{
var xamlText = string.Format(FlowDocumentFormat, ConvertRtfToXaml(rtfText));

return HtmlFromXamlConverter.ConvertXamlToHtml(xamlText, false);
}

private static string ConvertRtfToXaml(string rtfText)
{
var richTextBox = new RichTextBox();
if (string.IsNullOrEmpty(rtfText)) return "";

var textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);

//Create a MemoryStream of the Rtf content

using (var rtfMemoryStream = new MemoryStream())
{
using (var rtfStreamWriter = new StreamWriter(rtfMemoryStream))
{
rtfStreamWriter.Write(rtfText);
rtfStreamWriter.Flush();
rtfMemoryStream.Seek(0, SeekOrigin.Begin);

//Load the MemoryStream into TextRange ranging from start to end of RichTextBox.
textRange.Load(rtfMemoryStream, DataFormats.Rtf);
}
}

using (var rtfMemoryStream = new MemoryStream())
{

textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
textRange.Save(rtfMemoryStream, DataFormats.Xaml);
rtfMemoryStream.Seek(0, SeekOrigin.Begin);
using (var rtfStreamReader = new StreamReader(rtfMemoryStream))
{
return rtfStreamReader.ReadToEnd();
}
}

}