try
string sConnection = @"Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=C:\dbf;Extended Properties=dBase III";
OleDbConnection oCn = new OleDbConnection(sConnection);
OleDbCommand oCmd = oCn.CreateCommand();
oCmd.CommandType = CommandType.Text;
oCmd.CommandText = "SELECT * FROM authors.dbf";
OleDbDataReader oRd = oCmd.ExecuteReader();