Hello Aaditya,

Yes i Have a best example for this, accoring to your problem,

I give you a sample code for that

VF page:-

<apex:pageblock id="pgblck">
    <apex:pageblocktable value="{!WrapperList}" var="wraprec">
      <apex:column value="{!wraprec.accRec.name}"/>
      <apex:column value="{!wraprec.accRec.accountnumber}"/>
      <apex:column value="{!wraprec.accRec.annualrevenue}"/>
       <apex:column >
         <apex:facet name="header">
           <apex:inputCheckbox onclick="selectall()"/>
         </apex:facet>
        <apex:inputCheckbox value="{!wraprec.checkflag}" />
      </apex:column>
    </apex:pageblocktable>
  </apex:pageblock>
 <apex:actionFunction name="selectallmethod" action="{!selectallnone}" rerender="pgblck"/>       
 </apex:form>
  <script type="text/javascript">
    function selectall() {  
      selectallmethod();
    }    
    </script>
  </apex:page>

Controller Method:-

Public with sharing class checkAllcolumnDemocontroller {
Public List<wrapperclass> wrapList {get;set;}
Public boolean checked{get;set;}
  Public checkAllcolumnDemocontroller(){
  checked = false;
  }
   
  Public void selectallnone(){
    if(!checked)
      checked = true;
    else
      checked = false;
 }
   
  Public List<wrapperclass> getWrapperList(){
   wrapList = New List<wrapperclass>();
   for(Account acc:[Select name,accountnumber,id,annualrevenue,description from account limit 5]){
      if(!checked)
       wrapList.add(New wrapperclass(acc,false));
     else
     wrapList.add(New wrapperclass(acc,true));   
   }
   return wrapList;
  }
   
  Public class wrapperclass{
   Public account accRec{get;set;}
   Public boolean checkFlag{get;set;}
    
   Public wrapperclass(account acc,boolean flag){
    accRec = acc;
    checkFlag = flag;
   }
  }
}

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Mike Kaurav | Salesforce Developer | Mind Digital Group