After update visualforce page (picklist field) ...it wont refresh standard page..how it save standard page [duplicate]

Question

After update visualforce page (picklist field) it does not refresh standard page. How it save standard page?

This my controller:

public with sharing class Myorderextension {

    public list<my_order__c> orderslist {get;set;}

    public Myorderextension(ApexPages.StandardController controller) {
        orderslist=[select Id,Name,Quantity__c,Product__c,Customer__c,Status__c,Products__c  from my_order__c ];
    }

    public pagereference save() {
        pagereference  pgre1=new pagereference ('/apex/Myorderpage');
        return pgre1;
    }

    public pagereference Cancel() {
        pagereference  pgre=new pagereference ('/a00/o');
        return pgre;
    }
}

Answer 1

try with "setRedirect(true)"

pagereference pgre1=new pagereference ('/apex/Myorderpage'); pgre1.setRedirect(true); return pgre1;

Answer 2

public with sharing class Myorderextension {

    public list<my_order__c> orderslist {get;set;}

    public Myorderextension(ApexPages.StandardController controller) {
        orderslist=[select Id,Name,Quantity__c,Product__c,Customer__c,Status__c,Products__c  from my_order__c ];
    }

    public pagereference save()
    {
        pagereference pgre1 = new pagereference ('/apex/Myorderpage');
        pgre1.setRedirect(false); 
        update orderslist;
        return pgre1;
    }

    public pagereference Cancel()
    {
        pagereference  pgre=new pagereference ('/a00/o');
        return pgre;
    }

}