puzzle

Question

i want to create word search puzzle like this http://www.learncalifornia.org/GoDocUserFiles/2313.ws.jpg i need to hide the words in a 15 x 15 square letter matrix. Words can be in any of 8 directions in a combination of the following: horizontal, vertical, diagonal, forwards, and backwards. The application should display an answer key. how to ceate letter matrix and insert words randomly in it using c#? thanks in advance.