I've been getting this error, on very rare occasions. It happens before the OnClientPopulated event. The only way I can see the error is through the browser's debugger. The way I recreate the error(sometimes it takes more than 15 tries) is that I type, delete and repeat the process with a random name. I've configured the OnClientPopulating event to show a progress gif,OnClientPopulated gif hides and calls the web method that shows the list. Even if the name isn't on the database it shows the gif, hides it and says "not found". I know the error occurs in between OnClientPopulating and OnClientPopulated cause the gif keeps playing longer than it should.
This is the whole error:
> Uncaught Sys.ArgumentOutOfRangeException: Sys.ArgumentOutOfRangeException: Value must be an integer. Parameter name: y Actual value was 476.9090889386895.
The extender is placed on a web user control, this ascx is being called from an aspx. This aspx inherits from a pageBase class and that's where the extender calls the get method, just in case y'all are wondering how I have everything programmed.
I'm not posting what I've done cause it's quite long and I think it's irrelevant cause I've only fiddled with the existing events and I'm not doing anything to fancy inside them. If it's necessary to help me find a solution then I'll consider.