//implement idisposable
public void Dispose()
{
if (_csvReader != null)
{
_csvReader.Dispose();
}
if (_csvWriter != null)
{
_csvWriter.Dispose();
}
}
public void Dispose()
{
if (contactsReader != null)
{
contactsReader.Dispose();
contactsReader = null;
}
if (csvWriter != null)
{
csvWriter.Dispose();
csvWriter = null;
}
GC.SuppressFinalize(this);
}