Previous value is retained on posting a blank string

I Create an account with Fax Field value i.e. (account.Fax ="123456";)

Then I upadate the same Account using the below with account.Fax ="" or null

QSFTest.Sforce.SaveResult[] saveResults = binding.update(records);

This empty string does not update the Fax field and previous value for Fax which is 123456 is reflected.

While updating if I want to replace the previous value of fax with null.

How do I achieve the same?

Do we have any such preferences?

Thanks,

Manish

Superfell
you need to use teh fieldsToNull property, e.g.

account.FieldsToNull = { "Fax" };

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