Surefire Tips for Handling Errors in Excel VBA Programming

5. Nested Error Handling

You can use multiple levels of error handling in a nested way. This allows you to handle different types of errors separately.

Sub ExampleGoToZero()
	On Error Resume Next ' Ignore errors
	Dim result As Double
	result = 5 / 0 ' Errors are ignored
	On Error GoTo 0 ' Disable error handling
	MsgBox result
	result = 5 / 0 ' This will cause the program to terminate since errors are no longer ignored
End Sub

6. Input Validation Using IsNumeric

Before performing an arithmetic operation, you can validate the input using the IsNumeric function  to ensure that the data entered is numerical.

Sub ExampleGoToZero()
	On Error Resume Next ' Ignore errors
	Dim result As Double
	result = 5 / 0 ' Errors are ignored
	On Error GoTo 0 ' Disable error handling
	MsgBox result
	result = 5 / 0 ' This will cause the program to terminate since errors are no longer ignored
End Sub

Conclusion

Errors handling is an important part of programming in Excel VBA. By implementing various types of error handling, programmers can create more robust and user-friendly applications, as well as reduce the likelihood of crashes due to invalid input.