.NET Winforms Control for Spell and grammar check with formatting capabilities

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..NET Winforms Control for Spell and grammar check with formatting capabilitie
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Need a control which has spell and grammar check capabilities to be added to our Visual C# application

Our C# application has HTML controls every where in our application used as a control rather than an activex control. The HTML Editor has helped us with text editing and formatting, however does not provide spell checking and grammar checking functionality

The WebBrowser control can be used in our application, however it is an activex and I am not able to edit the control when the word is open in another window. I do not want word to open up in an another window from our application. Our application has a number of tabs and each tab has a section dedicated for the HTML editor which I downloaded from the Microsoft website

With Word I also have problems persisting the information to the database as a XHTML or xml easily. If I had typed only a few lines of code in the word editor control, how big will be my information when I persist it to the database

Does any one know a solution to our problem. Please help if you had the same problem, as to how you went about resolving it

Thanks