Problem with webbrowser document click and double click event for some html files.

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C#

C#4.0

Hi,

I am using webbrowser control to bind the html & text files data.
In that i want 2 options like Document click and Double click event.
In CLick event I want to retrieve the click position "word", and in the double click event I want to retrieve the "Sentance".

This is working fine for some files but some file it is not working properlly.

Here Iam not able to attach my code but the CLick event and double click event funtionality is
Click Event:

IHTMLDocument2 doc = (IHTMLDocument2)wbDocument.Document.DomDocument;
                IHTMLSelectionObject sel = (IHTMLSelectionObject)doc.selection;
                IHTMLTxtRange rng = (IHTMLTxtRange)sel.createRange();
                if (rng != null)
                {
                    rng.expand("word");
                    if (rng.text != null)
                    {
                        rng.@select();

                        if (rng.text.Trim() != "")
                        {
                            selectedWordorSentance = rng.text;
                            if (timer1.Enabled)
                            {
                                timer1.Stop();
                            }
                            timer1.Interval = 500;
                            timer1.Start();
                        }
                    }
                }

Double click event:

IHTMLDocument2 doc = (IHTMLDocument2)wbDocument.Document.DomDocument;
                IHTMLSelectionObject sel = (IHTMLSelectionObject)doc.selection;
                IHTMLTxtRange rng = (IHTMLTxtRange)sel.createRange();
                if (rng != null)
                {
                    rng.expand("sentence");
                    if (rng.text != null)
                    {
                        rng.@select();
                        if (timer1.Enabled)
                        { 
                            timer1.Stop(); 
                        }
                        selectedWordorSentance = rng.text;
                        ShowSelectedWordOrSentance();
                    }
                }