First try coding for Sudoku

Hi all, this's my first coding for Sudoku mini game by using C#. Anyone want to further improve this coding? 😆

This game is built with Visual Studio 2005 in C#.

** If game cannot be opened, please run as administrator.

Screenshot:

Software Link: https://drive.google.com/open?id=0B7_726VmtxyoSkZWZXBIZUcwWWs

Software coding link: https://drive.google.com/drive/folders/0B7_726VmtxyobWFURklheTB2a28?usp=sharing

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