How to Use the IsNumeric Function to Validate Data Entry in Microsoft Access

In this Microsoft Access tutorial, I will show you how to use the IsNumeric function to validate data entry, ensuring users input proper numeric values. Learn about VBA basics, input boxes, error handling, variable casting, and loop structures to improve your database functionality and avoid common data entry errors.
Zachary from Germantown, Maryland (a Gold Member) asks: I often need to print multiple copies of invoices. I have an InputBox that opens and asks the user how many copies they want. If they enter gibberish, like "xh2gf" I get an error message. I know I can use On Error to bypass the error, but is there a better way?
BECOME A MEMBER:
RUclips: / @599cd
or My Site: 599cd.com/THMe...
LEARN MORE:
IsNumeric: 599cd.com/IsNu...
PREREQUISITES:
Intro to VBA: 599cd.com/Intr...
Variables: 599cd.com/Vari...
If Then: 599cd.com/IfThen
InputBox: 599cd.com/Inpu...
For Next Loop: 599cd.com/ForNext
LINKS:
Invoicing: 599cd.com/Invo...
Error Handling: 599cd.com/Erro...
Type Conversion: 599cd.com/Type...
RECOMMENDED COURSES:
Access Expert 25: 599cd.com/ACX25
FREE TEMPLATE DOWNLOADS:
TechHelp Free Templates: 599cd.com/THFree
Blank Template: 599cd.com/Blank
Contact Management: 599cd.com/Cont...
Order Entry & Invoicing: 599cd.com/Invo...
More Access Templates: 599cd.com/Acce...
ADDITIONAL RESOURCES:
FREE Access Beginner Level 1: 599cd.com/Free1
How to Use Access in 30 Minutes: 599cd.com/30Mi...
$1 Access Level 2: 599cd.com/1Dollar
Donate to my Tip Jar: 599cd.com/TipJar
Get on my Mailing List: 599cd.com/YTML
Contact Me: 599cd.com/Contact
TechHelp: 599cd.com/Tech...
Consulting Help: 599cd.com/DevNet
Twitter: / learningaccess
en.wikipedia.o...
products.offic...
microsoft.com/...
KEYWORDS:
TechHelp, Access 2016, Access 2019, Access 2021, Access 365, Microsoft Access, MS Access, MS Access Tutorial, #msaccess, #microsoftaccess, #help, #howto, #tutorial, #learn, #lesson, #training, #database,, IsNumeric function, data validation, validate data entry, VBA, input box validation, error handling VBA, user input verification, numeric input check, If-Then statements, prevent input errors, validate numeric value, message box VBA, Access forms validation
QUESTIONS:
Please feel free to post your questions or comments below. Thanks.
Live long, and prosper.

[@Shadow.Dragon]

Great video, Richard! I wonder why the ISNumeric function doesn't catch a Null or blank string. Hmmmmm!

[@NimishP]

Can we add a spin control on Order form and then pass on value of that control when viewing / printing that invoice. We can pack all business rules in that control without any programming requirements. That will bypass InputBox dialog coupled with its limitations.

[@roberthutson2023]

I have a question, this is a more fun one to try and do and ill explain the situation in say the best I can. If you have 2 databases that are separate front ends but share the same back end. If for example, you work in a shop, and you work in the stockroom. If when you place an inventory stock request in the stockroom to say the companies warehouse, as you press the send button, how can you get a message box to show up on the other application in the warehouse saying new PO was submitted. This is one I have been working on and trying to figure out.