Version: 1.0
This property lets us determine the object or application that caused an error, and returns a string that contains its Class name or programmatic ID.
Also used when generating errors in your code to identify your application as the source, using the optional [ = string] argument, as below.
<%
On Error Resume Next
Err.Raise 8 'raise a user-defined error
Err.Description = "My Error"
Err.Source = "MyAppName"
Response.Write "An Error of the type '" Err.Description "' has been_ caused by '" Err.Source "'."
%>
"An Error of the type 'My Error' has been caused by 'MyAppName'."