Shinu,
Thank you very much for your reply. I upgrade the Telerik.web.ui.dll from Q2 2008 to Q3 2008. But after upgrade, my RadDatePicker control stop working. When I click calender icon, no calender popup. Even I remove all client side code for it, it is still not working. I got javascript error in Telerik runtime file. The error point to following part of code. The line of bold code is the place to cause error.
saveClientState:function(_23){
var _24=["enabled","emptyMessage"];
if(_23){
for(prop in _23){
_24[_24.length]=_23[prop];
}
}
var _25={};
for(var i=0;i<_24.length;i++){
_25[_24[i]]=this["get_"+_24[i]]();
}
return Sys.Serialization.JavaScriptSerializer.serialize(_25);
}