Problems off connection vb.net application(client poste) and Mysql server (no replies)

I want to install Mysql database in a server and my vb.net application in client post and for to establish the connection I had imported the mysql.data.Mysqlclient dll and I don't use the ODBC connetor, Now I have a lot off errors Messages the last is :
Access denied for root@...
I Don't know what I can do to succeed my istallation.
thanks for your help and excuse me for my bad english