c# - Handling error messages as exceptions -

can throw exception in 1 class , can catch exceptions in separate exception class in c#?

now question when ever values == null displaying message there itself. have use exceptions if values equal null. can throw exception like

if(customer == null)         throw new customernullexception(); if(incometype == null)         throw new incometypenullexception(); 

now can handle these exceptions in separate class??

exceptions bad idea handling errors. should rethink error handling architecture exceptions have huge overhead. please read exceptions , performance jon skeet.