You should use the OleDbConnection with a connection string like the following:
OleDbConnection cn = new OleDbConnection
("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\somepath;Extended
Properties=Paradox 5.x;");
See http://support.microsoft.com/default.aspx?scid=kb;en-us;326548#6 for more information.
This was first published in April 2004