here, my requirments whenever i am creating new records on case object, insert or update to custom object cases__C, suppose i want to delete records in case objects
that corresponding records delete in custom object cases__C.how to do ?

trigger CreateCases on Case (after insert,after update)
{

  Case cs=Trigger.new[0];
   Case csold=Trigger.old[0];
  if (Trigger.isInsert)
  {
     List<cases__C> caslist=new list<cases__C>();
     Cases__c ci=new Cases__c();
     ci.Case_Number1__c=cs.CaseNumber;
     ci.Origin__c=cs.Origin;
     ci.Priority__c=cs.Priority;
     ci.Status__c=cs.Status;
     ci.Type__c=cs.Type;
     ci.Description__c=cs.Description;
     ci.Subject__c=cs.Subject;
     ci.Reason__c=cs.Reason;
     insert ci;
     //calist.add(ci);
  }
  if(Trigger.isUpdate)
  {
  
    list <Cases__c> caupdate=new list<Cases__c>();  
    caupdate=[select id,Case_Number1__c,Origin__c,Priority__c,Status__c,Type__c,Description__c,Subject__c,Reason__c from Cases__c where Case_Number1__c =: cs.CaseNumber];
     integer si=caupdate.size();
     system.debug('-------------------'+si);
    
     for(Cases__c cx: caupdate)
     {
         cx.Case_Number1__c=cs.CaseNumber;
         cx.Origin__c=cs.Origin;
         cx.Priority__c=cs.Priority;
         cx.Status__c=cs.Status;
         cx.Type__c=cs.Type;
         cx.Description__c=cs.Description;
         cx.Subject__c=cs.Subject;
         cx.Reason__c=cs.Reason;
         update cx;
     }
   }
    Case csold=Trigger.old[0];
   if(Trigger.isDelete )
   {
  
    Cases__c casdel =new Cases__c();
     casdel =[select id,Case_Number1__c from Cases__c  where  Case_Number1__c =: csold.CaseNumber ];--------> delete records coding.
     if(casdel != NULL )
     {
      delete casdel;
      }
   }
  
}