Hello,

I am writing a code where i want functionality where if contact are not selected then it will throw error otherwise it will proceed further. i tried a lot. but its not working..
My code is:
public with sharing class ContactSelectClassController

{

    public String beforeblob1{get;set;}
    //public String conid{get;set;}
    public String emailEncoded { get; set; }
    public String email { get; set; }
    public String phoneEncoded { get; set; }
    public String con_number { get; set; }
    public String fullname{get;set;}
    public String emailName{get;set;}
    public String fullnameEncoded{get;set;}
    @TestVisible public List<wrapAccount> wrapAccountList {get; set;}
    //-----added----
   
    public List<Contact> selectedAccounts{get;set;}
    
    public String feedid;
    private  List<Id> contactids=new list<Id>();
    public List<Contact> cont{get;set;}
 
    public List<Feedback_Contacts__c> feedcon{get;set;}  
 
// ---------for search-------
    
    public List<wrapAccount> searchResults {get;set;}
    public List<String> selectP = new List<String>();
    
//--------------searchText--------------
   
    public string searchText {
        get {
            if (searchText == null) searchText = ''; // prefill the serach box for ease of use
            return searchText;
        }
        set;
    }  

   
//--------------ContactSelectClassController()--------------  
   
    public ContactSelectClassController()
    {
     feedid= (ApexPages.currentPage().getParameters().get('fid'));
     emailName= (ApexPages.currentPage().getParameters().get('emailName'));
     fullnameEncoded = ApexPages.currentPage().getParameters().get('fullname');
     emailEncoded = ApexPages.currentPage().getParameters().get('email');
     phoneEncoded = ApexPages.currentPage().getParameters().get('con_number');
              
      //-------added--------
         
      if(searchResults == null)
      {
        searchResults = new List<wrapAccount>(); // init the list if it is null
      }
      
      else
      {
        wrapAccountList.clear(); // clear out the current results if they exist
      }
           
      String qry =  'select Id,Name,Email,Phone from Contact  where firstname LIKE \''+String.escapeSingleQuotes(searchText)+'%\' OR lastname LIKE \''+String.escapeSingleQuotes(searchText)+'%\'';
      for(Contact c : Database.query(qry))
      {
             
     
        
         wrapAccount wa = new wrapAccount(c);
        searchResults.add(wa);
      
      }
           
    //-------added--------
       
      }

//--------------search()--------------


 public PageReference search() {
 
      searchResults = new List<wrapAccount>();
      
      String qry = 'select Id,Name,Email,Phone from Contact where firstname LIKE \''+String.escapeSingleQuotes(searchText)+'%\' OR lastname LIKE \''+String.escapeSingleQuotes(searchText)+'%\'';
      List<Contact> contactList = Database.query(qry);
       
       if(contactList.size()<1)
       {
       String htmlText = 'Oops...Contact not found, Sorry !';
       ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.Info, htmlText));
       }  
         
      for(Contact c : Database.query(qry)) {
          
            wrapAccount cw = new wrapAccount(c);
            searchResults.add(cw);
        }
       
     return null;
    }

//--------------CancelAction()--------------
   
   public pageReference CancelAction()
  {
    PageReference pr1 = new PageReference('/apex/SBSendSurvey');
    pr1.setRedirect(true);
    return pr1;
  }
    
    
//--------------processSelected()--------------
    
     @TestVisible public void processSelected()
     {
     try
       {
     
     feedid= (ApexPages.currentPage().getParameters().get('id'));
    
     fullnameEncoded = ApexPages.currentPage().getParameters().get('fullname');
   
     if(fullnameEncoded !=null || fullnameEncoded =='')
     {
        Blob bodyBlob1 =EncodingUtil.base64Decode(fullnameEncoded );
        fullname = bodyBlob1.toString();
        
     }
  else
  {
   fullname = ApexPages.currentPage().getParameters().get('fullname');
  }
    emailEncoded = ApexPages.currentPage().getParameters().get('email');
 
    if(emailEncoded !=null || emailEncoded =='')
    {
      Blob bodyBlob1 =EncodingUtil.base64Decode(emailEncoded );
      email = bodyBlob1.toString();
    }
  else
  {
   email = ApexPages.currentPage().getParameters().get('email');
  }
  phoneEncoded = ApexPages.currentPage().getParameters().get('con_number');
  if(phoneEncoded !=null )  
  {
  Blob bodyBlob2 =EncodingUtil.base64Decode(phoneEncoded );
  con_number =bodyBlob2.toString();
  }
  else
  {
  con_number=ApexPages.currentPage().getParameters().get('con_number');
  }
        
    selectedAccounts = new List<Contact>();
                            
        for(wrapAccount wrapAccountObj : searchResults)
         {
            if(wrapAccountObj.selected == true)
             {
                selectedAccounts.add(wrapAccountObj.acc);
                
             }
        }
        
           for(Contact cont : selectedAccounts)
              {
                contactids.add(cont.Id);
              }
           
       feedcon = new List<Feedback_Contacts__c>();

        cont  = new List<Contact>();
        cont  =  [Select firstname,lastname,email,id,name,MobilePhone from Contact where id in :selectedAccounts];
        for(Contact c :cont)
        {
       
        string fullname = c.firstname + ' ' + c.lastname;
      
        Blob beforeblob = Blob.valueOf(fullname);
        EncodingUtil.urlEncode(fullname,'UTF-8');
     
        string email = c.email;
        Blob beforeblob1 = Blob.valueOf(email);
        EncodingUtil.urlEncode(email,'UTF-8');
   
           string con_number = c.MobilePhone;

           Blob beforeblob2 = Blob.valueOf(con_number);
           EncodingUtil.urlEncode(con_number,'UTF-8');
    
       
        Feedback_Contacts__c fc = new Feedback_Contacts__c();
        fc.FeedbackContactName__c= c.Id;
        //system.debug('++++++++++ConNumber__c++++++++++'+ fc.FeedbackContactName__c);
        fc.FeedBackNo__c = feedid;
        // system.debug('++++++++++ConNumber__c++++++++++'+fc.FeedBackNo__c);

        fc.test__c = EncodingUtil.base64Encode(beforeblob );
        fc.Email__c = EncodingUtil.base64Encode(beforeblob1 );
       fc.ConNumber__c= EncodingUtil.base64Encode(beforeblob2 );
         //system.debug('++++++++++ConNumber__c++++++++++'+ fc.ConNumber__c+'**'+fc.FeedBackNo__c);
        feedcon.add(fc);
        //system.debug('++++++++++feedcon++++++++++'+feedcon);
       }
       insert feedcon;
        
        // system.debug('++++++++++INSERT++++++++++'+feedcon);
      
        Messaging.MassEmailMessage mail = new Messaging.MassEmailMessage();
        mail.setTargetObjectIds(contactids);
   
     if(!Test.isRunningTest())
     {
   
          EmailTemplate templateId = [Select id from EmailTemplate where name = 'SurveyFeedback'];
         // system.debug('+++++++++++++++++++++++TEMPLATE ID++++++++++++++++++++++++++++++'+templateId.id);
          
        mail.setTemplateId(templateId.id); //00X55000000E1LO
        Messaging.sendEmail(new Messaging.MassEmailMessage[] {mail});
        
      }   
        String msg1 = 'Mail Sent!';
      ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.INFO,msg1));
    }
        catch(Exception e) {
       // System.debug('Oops ! Email limit exceeded...Sorry');
               ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.Error,'Message not sent'));
System.debug('*********************Oops ! Email limit exceeded...Sorry******************************');
      }    
     }
     
     
//--------------class wrapAccount--------------

    @TestVisible public class wrapAccount {
        public Contact acc {get; set;}
        public Boolean selected {get; set;}
 
        public wrapAccount(Contact a) {
            acc = a;
            selected = false;
        }
    }
    
    
//--------------Redirect()--------------

    
    public PageReference Redirect(){
    PageReference ref = new PageReference('/apex/SBEmailTemplate');
    ref.setRedirect(true);
    return ref;
    }
    
    
    public PageReference RedirectCon(){
    PageReference ref = new PageReference('/apex/ContactPage');
    ref.setRedirect(true);
    return ref;
    }
    
}

Thanks & regards,
Satakshi