Why can't display some columns in public site of salesforce? - salesforce

Question

This is full code:
Controller:
public class TestController {
public List<MyProduct__c> MyProducts {get;set;}
public string searchstring {
get{
if (searchstring==null) searchstring = '';
return searchstring;
}
set;}
public TestController()
{
search();
}
public void search(){
string searchquery='select Product_Code__c,name,price__c,imagename__c from MyProduct__c where name like \'%'+searchstring+'%\' Limit 20';
MyProducts= Database.query(searchquery);
}
}
Home Page is a visualforce page:
<apex:page controller="TestController" >
<apex:form >
<div align="center">
<apex:inputText style="width: 360px; height: 25px" value="{!searchstring}" label="Input"/>
<apex:commandButton value="Search" action="{!search}" />
</div>
<apex:pageBlock title="Search Result">
<apex:pageblockTable value="{!MyProducts}" var="a">
<apex:column >
<apex:image width="100" height="100" value="{!URLFOR($Resource.ProductImage, 'ProductImage/' & a.ImageName__c)}"></apex:image>
</apex:column>
<apex:column value="{!a.ImageName__c}"/>
<apex:column value="{!a.Product_Code__c}"/>
<apex:column value="{!a.Name}"/>
<apex:column value="{!a.Price__c}"/>
</apex:pageblockTable>
</apex:pageBlock>
</apex:form>
</apex:page>
Result when click Preview from Developer Console:
It display 4 columns and image view ok.
But if Run from a public site and not login salesforce:
It only display 2 columns:
Why can't display 2 columns(ImageName__c,Price__c) in public site?

Answer 1

It might have to do with permissions.
Visualforce is a framework that enforces Salesforce's security measures directly, so if the user which is accessing the Visualforce page does not have permission to see a certain field, it will not render it.
I would suggest you check profiles/permission sets and verify that the user accessing the page has enough access.