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sai manognasai manogna 

will trigger.old throw an error for before insert?

will trigger .old throw an error for before insert?
Raj VakatiRaj Vakati
Yes ..it will through a null pointer exception 

unexpected exception, contact your administrator: TrigUpAcc: execution of BeforeInsert caused by: System.NullPointerException: Attempt to de-reference a null object: 
  
trigger TrigUpAcc on Contact (before insert) 
{
   
    for(Contact c : Trigger.new)
    {
       
    }
     for(Contact c : Trigger.old)
    {
        if(c.FirstName!=Null){
            
        }
       
    }
    
    
   
}