c# - Unable to cast object of type 'System.Int16' to type 'System.String' -

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i encounter following exception in linq query .

unable cast object of type 'system.int16' type 'system.string'.

 var query = t in dt.asenumerable()                         select new                         {                             sys_db= t.field<int16>("process_id").tostring() + "|" + t.field<string>("db_code").tostring(),                             process_name = t.field<string>("process_name").tostring()                         };

why problem appear , how fix ?

this

t.field<string>("db_code").tostring()

perhaps should this:

t.field<short>("db_code").tostring()

or equivalent

t.field<int16>("db_code").tostring()

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