The Err object has three important properties that you will use regularly in error handling. The first of these properties is Number, which contains an integer value that indicates the last error encountered. When a trappable error occurs in VB, a code is passed to the Number property of the Err object. By using Err.Number, you can allow your error handler to see what error has occurred. The values and description of error codes is available in VB Help under the heading Trappable Errors.