How to display Custom Setting data using Apex in Visualforce page?

How to display Custom Setting data using Apex in Visualforce page?

Sample Code:

Visualforce Page:

<apex:page controller="sample" sidebar="false" >
<apex:form >
    <apex:pageblock >
        <apex:pageblockTable value="{!code}" var="c">
            <apex:column value="{!c.Name}"/>       
            <apex:column value="{!c.Code__c}"/>
        </apex:pageblockTable>
    </apex:pageblock>
</apex:form>
</apex:page>

Apex Controller: public class sample {     public List<CountryCodes__c> code {get;set;}        public sample()     {         Map<String,CountryCodes__c> allCodes = CountryCodes__c.getAll();         code = allCodes.values();     }     } Output: