Best Error message show in web/windows application.

There are four rules to be follow to give a error message to user while their is a error in your application These are as follows.

• The error message needs to be short and meaningful.
• The placement of the message needs to be associated with the field.
• The message style needs to be separated from the style of the field labels and instructions.
• The style of the error field needs to be different than the normal field

Like:

There was a problem to retrieving the XML data : node not available x000000x123