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Make sure that the connection to the database is open when doing reader.Read()
Re: Capture picture
I think this is what you're looking for... [URL="http://www.codeproject.com/KB/directx/directshownet.aspx"]Link[/URL] Download the source and use the SampleGrabber folder. The project will need to be converted to the visual studio version your using. This only captures the image from a webcam, you'll need to do the database integration yourself.
Use Math.Sqrt [code] double squareRoot = Math.Sqrt(value you want the square root of); [/code]
The End.