Openning an access database using ADO.NET

What is the proper way to open an access database using ADO.NET (that is, using c#) ?
I have the following code, but somehow it does not compile saying that it doesn't find the mdb file called PhoneBook :

OleDbConnection Myconnection = null;
Myconnection = new OleDbConnection(@."Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\PhoneBook");
Myconnection.Open();

What am I doing wrong here ?
All help appreciated !:)Stab in the dark:
change C:\PhoneBook to include the file extension i.e. C:\PhoneBook.mdb|||http://www.connectionstrings.comsql