I have used isnumeric() method to check for the strings with only numbers.

While deploying to production i am receiving the following error 'Method not found '.

Attribution to: Keepcalmncode

Possible Suggestion/Solution #1

isNumeric() is a new String Method in the Winter '13 release.

Your Production instance has not yet been updated from Summer '12 (API-25) to Winter '13 (API-26) yet but your sandbox has which is why your code will not deploy.

You will need to wait till your Production instance is upgraded to deploy your code. You should have recived an email with the title 'Winter '13 Release Notification' That contains the date. (Our instance is on EU1 and is scheduled for Friday, October 5 - Saturday, October 6, 2012)

http://developer.force.com/releases/release/Winter13/New+String+Methods

Some more Winter '13 release info for sandboxs:

http://blogs.salesforce.com/product/2012/07/winter-13-sandbox-preview-instructions.html

Attribution to: Jon Hazan
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/1882