RadComboBoxItemsRequestedEventArgs.Text Return "%D8%AD%D8%B3%D8%A7%"

[Sayed]

Im Implement RadrCombo Box To Enable Search But Random On

RadrCombo _ItemsRequested  e.Text Returns %D8%AD%D8%B3%D8%A7%
So the DataView.RowFelter  throw  Execption 
 the string pattern '%D8%AD%D8%B3%D8%A7%' is invalid.
Plz Any One Can Help Me How to Solve This Problem