how to return results from code block

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How to return single row or results from code block executed using ADO.NET ExecuteQuery() method.
I tried
 
DO $$
declare
  i integer :=0;
 
begin
select i+1 as res1, i+2 as res2;
END$$;
 
but got error:
 
ERROR:  query has no destination for result data
 
How to return single row result from code pgsql  code block ?
 
Andrus.

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