asp.net mvc - MVC3 Handling of exceptions in catch blocks and throw Exceptions -

i want understand how can handle rest service specific exceptions in mvc3. pointers? basically, have controller , there might multiple try catch blocks , throw statements exceptions. i'm little confused after reading posts. edit:

public actionresult index()     {         iconsumerrequest conreq = osession.request();         conreq = conreq.get();         conreq = conreq.forurl(session["serviceendpoint"].tostring());         try         {             conreq = conreq.signwithtoken();         }         catch (exception ex)         {             throw ex;         }         return view();     } 

on throw exception, need able redirect custom error page. read through post too: custom error pages on asp.net mvc3 how handle different error codes 302 or else if application not running on iis.

bellow nice link custom exp handling

click here