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How to add a checkbox in pageblocktable row?

I need to show all the custom object records in pageblocktable. Before populating all the records i need to add a picklist value, Checkbox in the first row and then populate all the records. How can i do that. Here is the screenshot and VF code and class.

User-added image

VF code:
<apex:page standardcontroller="Opportunity" extensions="oppgapstatus">
<apex:pageBlockSection id="Info">
<apex:pageBlockTable value="{!WrapperList}" var="wraprec">
<apex:column value="{!wraprec.accRec.Name__c}"/>
<apex:column value="{!wraprec.accRec.Satisfied__c}"/>  
<apex:column value="{!wraprec.accRec.Current_Status__c}"/>
<apex:column value="{!wraprec.accRec.LastModifiedDate}"/>
<apex:commandbutton value="Save" action="{!UpdateSelectedRecords}"/>
<apex:commandbutton value="Cancel"/>

Apex class:
Public class oppgapstatus{
 Public Opportunity optyList{get;set;}
 Public Opportunity_Status__c opst{get;set;}
  public PageReference openPresentationOptions() {
      return null;
 private ApexPages.StandardController controller;
 public oppgapstatus(ApexPages.StandardController controller) {
//Checkbox selectall        
Public List<wrapperclass> wrapList {get;set;}
Public boolean checked{get;set;}
Public string selectedField {get;set;}
Public string inputVal{get;set;}
  Public void selectallnone(){
      checked = true;
      checked = false;

  Public List<wrapperclass> getWrapperList(){
   wrapList = New List<wrapperclass>();
   for(Opportunity_Status__c acc:[select name,Satisfied__c,Current_Status__c,LastModifiedDate from Opportunity_Gaps__c where Opportunity_Detail__c =: optyList.Id]){
     wrapList.add(New wrapperclass(acc,false)); 
     wrapList.add(New wrapperclass(acc,true));   
   return wrapList; 
   Public class wrapperclass{
   Public Opportunity_Status__c accRec{get;set;}
   Public boolean checkFlag{get;set;}
   Public wrapperclass(Opportunity_Status__c acc,boolean flag){
    accRec = acc;
    checkFlag = flag;

Can anyone help me.? Thanks in advance
Amit Chaudhary 8Amit Chaudhary 8
Shrikant BagalShrikant Bagal
Please try following link:

- http://mycloudexperience.blogspot.in/2011/03/adding-checkbox-on-pageblocktable.html

if its resolved your issue,please mark as best answer so it will help to other who will serve same problem.