Help needed!!!

I have developed a smart device application using VS.net
2003. It runs good at Pocket PC 2002 emulator that I am
able to access the SQl server2000, but when I finished
deploying it on the target PDA, Toshiba e740, and run the
application from the PDA, I got an error
saying: "PlatformNotSupportedException" and I found that
error caused by the code line SqlClient SqlConnection
object OPEN method.

Any one has any idea about this problem? How can I fix
it? Please help! Thank you in advance.

Jesse