The user enters the number in the textbox and then clicks an open spot on the board. The number of zero means to delete the current number. After every move the system checks if it is a winning board. Note the following:

1) Randomly populate the board with 20 numbers, that have no duplicates in the rows and columns

2) Only check for duplicates in row and columns, not the inner 3x3 of a real SuDoKu game.

3) The user can not change or delete one of the 20 original numbers put on the Board in step one.

4) Include new game button that starts the process again.

5) Each square should be a button.

6) The Board must be dynamically generated, not completely defined in design time.