Edit and Delete functionality............

==================VFPAGE=============
<apex:page sidebar="false" controller="task3b">
<style Type="text/css">
  .ashok{
      background-color:blue;
  }
</style>
  <apex:form id="f">
    <apex:pageBlock title="Edit/Delete" mode="Edit" tabStyle="Book__c">
       <apex:pageblockTable var="bk" value="{!bkList}">
           <apex:column headerValue="Action">
              <apex:outputLink title="" value="/{!bk.id}/e?retURL=/apex/{!$CurrentPage.Name}">Edit</apex:outputLink>  &nbsp;&nbsp;
              <a href="javascript:if (window.confirm('Are you sure?')) DeleteRecord('{!bk.Id}');" style="font-weight:bold">Del</a>
           </apex:column>
           <apex:column value="{!bk.name}"/>
           <apex:column value="{!bk.Price__c}"/>
       </apex:pageblockTable>
       <apex:actionFunction name="DeleteRecord" action="{!Del}" reRender="f" >
          <apex:param value="" name="Rec" assignTo="{!bl}"/>
       </apex:actionfunction>
     </apex:pageBlock>
  </apex:form>
</apex:page>
==========CONTROLLER===============
public with sharing class task3b {

    public void Del() {
        if(bl==null){
            return ;
        }  
        book__c bl1=null;
        for(book__c bks:bklist){
           if(bks.id==bl){
             bl1=bks;
           }
        }
        if(bl1!=null){
           delete bl1;
        }
        AshokMehtod();
    }

    public void AshokMehtod(){
       bkList=[select id,name,author__c,price__c from book__c];
    }
    public task3b(){
       AshokMehtod();
    }
    public string bl{set;get;}
    public List<book__c> bkList {get; set;}
     
}