error 'there is already an open datareader associated with this command which must be closed first'

Question

runtime error \'there is already an open datareader associated with this command which must be closed first\'

objCommand = new SqlCommand(\"SELECT field1, fi         


        

Answer 1

INSERT INTO tablename (field1, field2)
    SELECT 3, field1 FROM sourcetable

A single SQL statement instead of one per insert. Not sure if this will work for your real-life problem, but for the example you provided, this is a much better query than doing them one at a time.

On a side note, make sure your code uses parameterized queries instead of accepting strings as-is inside the SQL statement - your sample is open to SQL injection.