newline in constant error

Hi,

I've been getting this error for a long time and haven't been able to figure it out. Up until now I've been doing workarounds to avoid this type of error, but I want to figure out how to fix it without the workarounds.

The error is:
CS1010: Newline in constant

And this is the code:

string scriptString = "<script language=\"JavaScript\" src=\"";
scriptString += appPath + "/js/popupmenu.js\"></script>";

The thing I really don't get is that if I put this exact same code in a cs file it compiles, but if I put it between script tags in an aspx file the error occurs...Hm, I found the answer for anyone who's interested:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;827420

However, why is this behavior by design? Shouldn't the error message be more specific if you're not supposed to put </script> in a string?

Thanks to anyone if they replied before this message gets approved.
Can you show us the full error (including the 5 lines of code that it shows)? There might be more to it.