in wpf rich text box there is some delay to display data while typing

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C#

.NET

Me having one rich text box, while typing some content to the rich text box some delay to display content in the rich text box,am getting the the value from that richtext box by following code.So please help me to solve this


System.Windows.Documents.TextRange textRange =
new System.Windows.Documents.TextRange(rtbComments.Document.ContentStart, rtbComments.Document.ContentEnd);