How to specify maxJsonLength property in web.config

If you're getting the following exception while using JavaScriptSerializer: "Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property." - you may enlarge the default maxJsonLength value in web.config: <system.web.extensions>     <scripting>        <webServices>           <jsonSerialization maxJsonLength="123456"></jsonSerialization>        </webServices>     </scripting> </system.web.extensions>