Perform two different types of Mail Merge operations: simple Mail Merge and Mail Merge with regions using C#. Simple Mail Merge repeats the entire document per each data source record, whereAs Mail Merge with regions repeats only designated regions per record....Perform two different types of Mail Merge operations: simple Mail Merge and Mail Merge with regions using C#. Simple Mail Merge repeats the entire document per each data source record, whereas Mail Merge with regions repeats only designated regions per record.