Input the username&password Automatically on the 802.1x clientOptions

Select 802.1x Network Authentication and the md5-challenge.When the
windows client access the 802.1x Restricted Network, the windows
raises a dialog to
query the username&password.

Now I want to disable the dialog and automatically input the
username&passowrd by my program.I am Confused how to do. I have no
any
idea.Please help me.Many thanks.