account acc = new account();
acc.accountid = new Key(new Guid("249FB2CF-31CD-DE11-AB59-005056B30605"));
Lookup lookup = new Lookup();
lookup.IsNull = true;
lookup.IsNullSpecified = true;
acc.primarycontactid = lookup;
crmservice.Update(acc);
This code works but there is more elegant and readable way to clear fields:
account acc = new account();
acc.accountid = new Key(new Guid("249FB2CF-31CD-DE11-AB59-005056B30605"));
acc.primarycontactid = Lookup.Null;
crmservice.Update(acc);
Similar approach also will work for CrmDateTime, CrmNumber, Picklist, Customer, CrmMoney, CrmFloat, CrmDecimal fields.
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