double getValue(int fieldno);

The function getValue() returns content of any numeric field as a double value.
Do not forget to call readRecord().

If dbf file contains non-ASCII symbols, you have to use a similar function and provide a code page:
string getString(int fieldno, EncodingInfo e);

    // your code
    dbf.readRecord( row );
    Console.WriteLine( dbf.getValue( 0 ).ToString() );
    // your code