Duwamish中DataAccess.Customers在实现DISPOSE来释放对象的实例变量时为什么只是释放dsCommand,而没有释放insertCommand,updateCommand?

Question

Duwamish中DataAccess.Customers在实现DISPOSE来释放对象的实例变量时为什么只是释放(SqldataAdapter)dsCommand的CONNECTION等,而没有释放(SqlCommand)insertCommand,updateCommand和它们的CONNECTION?以下部份代码:
        private SqlDataAdapter dsCommand;
        private SqlCommand loadCommand;
        private SqlCommand insertCommand;
        private SqlCommand updateCommand; /// <summary>
        /// Free the instance variables of this object.
        /// </summary>
        protected virtual void Dispose(bool disposing)
        {
if (! disposing)
return; // we're being collected, so let the GC take care of this object            if (dsCommand != null)
            {
                if(dsCommand.SelectCommand != null)
                {
                    if( dsCommand.SelectCommand.Connection != null  )
                    {
                        dsCommand.SelectCommand.Connection.Dispose();
                    }
                    dsCommand.SelectCommand.Dispose();
                }    
                dsCommand.Dispose();
                dsCommand = null;
            }
        }

Answer 1

那为什么有这句呢,这好像是释放COMMAND对象,那其它的COMMAND对象不是同一个吧(UPDATE,INSERT的)
dsCommand.SelectCommand.Dispose();