how to refresh a VF page? - salesforce

Question

I have created a VF page for an object Merchandise,which consists of 3 fields - name,price and quantity.when ever I create a new record and click save button , new record is saved in tat object (Merchandise) but the values in the fields are not refreshed.
What has to be added to the code, which is given below:
public with sharing class mdetailcon {
public Merchandise__c mer{set;get;}
public mdetailcon(){
mer = new Merchandise__c();
public PageReference save() {
insert mer;
return null;
} }
<apex:page sidebar="false" showHeader="false" controller="mdetailcon">
<apex:form >
<apex:pageBlock >
<apex:pageBlockSection columns="1" >
<apex:inputField value="{!mer.name}" label="Name"/>
<apex:inputField value="{!mer.Price__c}" label="Price"/>
<apex:inputField value="{!mer.Q__c}" label="Quantity"/>
</apex:pageBlockSection>
<apex:commandButton value="save" action="{!save}"/
</apex:pageBlock>
</apex:form>
</apex:page>

Answer 1

I got the answer,check the code below
public PageReference save() {
insert mer;
PageReference pageRef = new pageReference('/apex/merchdetail');
// ('/apex/yourvfpagename',as the vfpage i have created was merchdetail)
pageRef.setRedirect(true);
return pageRef;
}