first you must downloaded a connector for .net.
MySQL :: Connector/Net 6.1

then install this.
then you must added dll in VS as reference.

and here is documentation with exampels
MySQL :: MySQL 5.1 Reference Manual :: 21.2.5.4 Using Connector/NET with Connection Pooling

and here is one example what's you need.
MySQL :: MySQL 5.1 Reference Manual :: 21.2.5.5 Using the Connector/NET with Prepared Statements