In this tutorial, I will explain about Data table by using Primary Key Property. Primary Key Property Return Type is "DataColumn" it was an Array. Return An array of System.Data.DataColumn objects. if there is an Exceptions then it will fire the System.Data.DataException.
source https://www.c-sharpcorner.com/Blogs/how-to-join-two-datatables-using-c-sharp-in-adonet
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