I am having this issue and was hoping if somebody have any insight or fix to it.

   My company's web hosting company just updated to the .NET Framework Service Pack 3 last Thursday and that is when I saw the problem. There is a dropdown list that the user can select the different type of payment like "Visa, Mastercard, Discover, etc.". The dropdown gets created in Javascript and use Page.RegisterClientScriptBlock() to register it. There is a onChange function that check what type of payment get selected and either disable or enable the nearby input textbox for the credit card number. The page loads up fine, but everytime the dropdown list get selected the user will get a runtime error complaining that the dropdown is null or not an object.

   It used to work properly until this Service Pack. In fact my development machineworks fine without it until I install the service pack. So I know the service pack broke it.


   Thanks
   Song

Hi,
Before using the DDL in javascript just check whether its null or not, i hope it will solve your problem.

  Thanks for the reply. On load, it gets loaded and have a value. I believe it have something to do with Postback which makes it get skip or invisible. And it is only on the latest Service Pack, so had to see what changes MS did.