What version of .NET and Visual Studio are you using? AFAIK there was a bug in a version of Visual Studio that caused this error.
Are you using a master page by any chance? On Sun, Nov 15, 2009 at 4:20 PM, Himanshu <[email protected]>wrote: > in my project i hv a update panel and > all the control in update panel and as well as update panel tag > underline with red tag > and in tooltip its showing this msg > > element is not a known This can occur if there is compilation error. > > when ever i run the application its working fine no probs with all > > but > > problem is that in my all pages ajax conrols are not reconized and > when i drag any conrol in the > page its doesnt take id and shows known elemnt > or in any ajax conrol i drag standrd controls they also shows not > known element > any buddy plz can help me > sory for bad english > thank u >
