Sudoku problem

[C# Programming]

Hello guy´s

I´ve a problem with the implementation of Sudoku in c#....

i wrote 2 for-loops, one that tests the collums, one that tests the rows if the numbers 1-9 are unique in a row/col... The 2 Loops are working perfect, but only if i use ONE of them.. The 2 loops are not working together , I think it´s a Overflow...
I try to interlace the for-loops, but i´m with stupid.. I have to ask for help in this forum

here is the rs-link for my vs-2005 project
5 times, because it can be downloaded only 10 times each..

"http://rapidshare.com/files/271843801/sudokue.zip.html"
"http://rapidshare.com/files/271845950/sudokue.zip.html"
"http://rapidshare.com/files/271846172/sudokue.zip.html"
"http://rapidshare.com/files/271846938/sudokue.zip.html"
"http://rapidshare.com/files/271847164/sudokue.zip.html"



Thanks for help, members of coding...
I´m sure, its only a LITTLE 1-MINUTE problem 4 you...

If you solve my problem, you can answer this post or email me @ dennis.wahlen@web.de

Thank again..^^