Server Error in '/da3wa' Application.   A potentially dangerous Request.Form value was detected from the client  (ctl00$ContentPlaceHolder1$Button1="حف&#1592...").  Description:  Request Validation has detected a potentially dangerous client input value,  and processing of the request has been aborted. This value may indicate an  attempt to compromise the security of your application, such as a cross-site  scripting attack. You can disable request validation by setting  validateRequest=false in the Page directive or in the configuration  section. However, it is strongly recommended that your application explicitly  check all inputs in this case. 
 
 Exception Details:  System.Web.HttpRequestValidationException: A potentially dangerous  Request.Form value was detected from the client  (ctl00$ContentPlaceHolder1$Button1="حف&#1592...").
 
 Source  Error: 
 
     The source code that generated this unhandled exception can only be  shown when compiled in debug mode. To enable this, please follow one of the  below steps, then request the URL:
 
 1. Add a "Debug=true" directive at the  top of the file that generated the error. Example:
 
    <%@ Page Language="C#" Debug="true"  %>
 
 
 or:
 
 2) Add the following section to the  configuration file of your application:
 
  <configuration>
    <system.web>
        <compilation  debug="true"/>
    </system.web>
 </configuration>
 
 
 Note  that this second technique will cause all files within a given application to be  compiled in debug mode. The first technique will cause only that particular file  to be compiled in debug mode.
 
 Important: Running applications in debug  mode does incur a memory/performance overhead. You should make sure that an  application has debugging disabled before deploying into production  scenario.