How to scan imges from scanner using twain_32.dll using my own inteface?

Hi Everybody!!!
I m a intermediate in C#. I m designing an application for scanning images from any scanner using 'twain_32.dll' of the twain working group.
i found a code here on the code project which did most of the work on scanning the image and bringing it back to the application's picturebox.
But theres a problem in this code and that is this code does scan the images but during scanning it opens the interface of the attached scanner (ex. i have hp psc 1315 scanner) and the image is scanned via that interface and then the control hope to my application and the picture is copied to my application.
I want to create my own interface of scanning , i dont want my scanner's interface to open during scanning.
Hope u got my point.
Please suggest me how i can accomplish this.

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