When chosen, calls ExecuteNonQuery instead of ExecuteReader.
With ExecuteNonQuery, no result can be retrieved, only records affected can be retrieved.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery(v=vs.100).aspx
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery(v=vs.100).aspx
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