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How to find the content height of the Flow document?

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :WPF
Hi Dudes, I have a RichTextBox control in my application. When the user types the content inside the RichTextBox and clicks ok i need to validate such that the content that the user entered should not overflow the controls Height. So i need to find the height of the FlowDocument property of the RichTextBox Control. I dont have an option to find the height found one way from surfing around        double GetDocumentHeight()         {             Rect rectStart = Document.ContentStart.GetCharacterRect(LogicalDirection.Forward);             Rect rectEnd = Document.ContentEnd.GetCharacterRect(LogicalDirection.Forward);             if (!Double.IsInfinity(rectEnd.Bottom) && !Double.IsInfinity(rectStart.Top))             {                 return rectEnd.Bottom - rectStart.Top;             }             else             {        

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