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Dataload into custom objects via dataloader with custom business logic



I am trying to upload data into a custom object one field of which is a look up to "Contact". I need to check if the current custom object record has a similar Contact record and need to tie it as a parent Contact record. Is it possible to do through dataloader or I need to write custom code in .NET to call APIs to achieve this functionality?





You can't implement this sort of logic in DataLoader.  You'll have to write Apex or API code to do this.