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For more information, see Turn off constraints while filling a dataset.
The event you choose depends on how granular you want the validation to be.
You can confirm that data that's being written to a dataset is valid by building validation checks into the dataset itself.
I would like to be in a position to call this method from all my forms in my code.
Because the dataset is part of your application (unlike the database backend), it's a logical place to build application-specific validation.
The best place to add validation to your application is in the dataset's partial class file.
It's a good practice to validate data prior to sending updates to the underlying database.
This reduces errors as well as the potential number of round trips between an application and the database.