The ResultCode read-only property returns the result of the
last action performed by the client. This property should be checked
after the Command method is used to execute a command on the
server to determine if the operation was successful.
If the ResultCode property returns a value of true, that
corresponds to an OK response from the server which indicates that
the command was successful. If the property returns a value of false,
that corresponds to an ERR response from the server which indicates
that the command failed. The ResultString property typically
returns more detailed information as to why the command failed.