richTextBox_LessonView.Document = new FlowDocument(); TextRange documentTextRange = new TextRange( richTextBox_LessonView.Document.ContentStart, richTextBox_LessonView.Document.ContentEnd); using (FileStream fs = File.Open(folderloc + display_lesson, FileMode.Open)) documentTextRange.Load(fs, System.Windows.DataFormats.Html);
var
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