After extending a textbox with a NumberUpDownExtender, which comes with the AJAX Control Toolkit, I recieved the error “the number of fractional digits is out of range”. This happened when debugging my web application and using the extender. When using the web app in non-debug mode, nothing happened. This included the value change ’not happening'.
Fortunately, this one was REALY easy, but it is not to be found on the web.