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Redirect to same page with page refresh


  I have writted a controller to check if attached is added or not on a custom object if not added it will show a message else submit for approval. 

  I want to redirect to same page where the user clicked the button from with page refresh I added below code but it is not working please suggest me how to modify the code. 
public class  check_spr_coterm
Integer count = 0;
String PageID; 
 public check_spr_coterm()
   SPR__c SP;
   //OpportunityLineItem OLI;
   SP = [select id,Opportunity__c from SPR__c 
          where Id = : ApexPages.currentPage().getParameters().get('id') limit 1];
   PageID = ApexPages.currentPage().getParameters().get('id');
   List<AggregateResult> OLI = [select count(id) from OpportunityLineItem 
                                where opportunityid = :SP.Opportunity__c and name like '%COTERM%' ];
   List<AggregateResult>  ATH = [select count(id) athcnt from  Attachment 
                                 where parentid = :ApexPages.currentPage().getParameters().get('id')];  
   count = (Integer)ATH[0].get('athcnt');  
 public void pageAction(){
     if(count ==0){
         ApexPages.addMessage(new ApexPages.Message(,'You cannot submit as this record dont have attachment'));      
        Approval.ProcessSubmitRequest req = new Approval.ProcessSubmitRequest();
        Approval.ProcessResult result = Approval.process(req);
        //ApexPages.addMessage(new ApexPages.Message(,'Sucessfully submitted for approval'));
 public PageReference redirectpage()
   PageReference pageRef = new PageReference(PageID);
   return pageRef;

Hi Sudhim,

Please use below code then you would be able to solve your problem.
And believe PageID would be your record id.

Please mark as a best answer if it resolve your probelom.

PageReference pageRef = new PageReference('/'+PageID);
return pageRef;