Live Demo

Error Handling in ASPPY

On Error Resume Next, Err object, and defensive patterns

On Error Resume Next

When enabled, execution continues after errors. Use Err.Number to check.

Err.Number: 11
Err.Description: Division by zero
Err.Source:

The division by zero was caught and handled gracefully. Without On Error Resume Next, it would crash the page.

Type Mismatch Example

Mismatched types raise error 13.

Result: abc42

Database Error Pattern

Safe DB query pattern using On Error Resume Next.

Safe Error Handler

A reusable pattern for any operation.

Last error caught: 13 - Type mismatch

Trigger an Error

Use Err.Raise to generate custom errors for testing.

Raised Error 9: This is a test error raised by Err.Raise
Source: Demo
Overflow (6) Subscript (9) Type mismatch (13) Object required (424)

Key Learning

  • Always use On Error Resume Next before risky operations
  • Check Err.Number <> 0 immediately after
  • Call Err.Clear after handling to reset state
  • On Error GoTo 0 is not supported in ASPPY — use Err.Clear instead
  • vbCrLf and underscore line continuation work normally