Defines a datatable dt_ drugs, all the data query, give dt_ all drugs, now want to update the field inside, wrote a has a problem, don't know how to change, trouble under the guidance of the

 
Var query=(from dt dt_ all drugs in 
Where dt. Field Size (" code ")==123 
Select dt). FirstOrDefault (); 
Query. "city health code"=321; 
Query. SubmitChanges (); 

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