Hi Vamsi, 

Still action is happening. data is getting insert from the function i am calling from the button. 

  I have highlited the function in below controller which is getting called from button. Please check

Controller


public with sharing class CCW_ContactPaginationController {

  //URL Passing Parameters.
  String PageContractId = ApexPages.currentPage().getParameters().get('ContractId');    
  String PageAccountId  = ApexPages.currentPage().getParameters().get('AccountId');  

  public Asset GetAccount{get;set;}
  public Asset GetContract{get;set;}
  public Asset GetExpireDate{get;set;}
  public Asset GetReseller{get;set;}
  public Asset GetDistributor{get;set;}
  public Boolean IncumbentReseller{get;set;}
  public Boolean Education{get;set;}
  public Asset GetOpportunity{get;set;}
  public Asset GetNewOpportunity{get;set;}
  public String ExpireTerms{get;set;}

  //Our collection to class/wrapper objects wrapAsset
  public List<CCWRowItem> wrapAssetList {get; set;}
  public List<Asset> selectedAssets{get;set;}
   /*
    *   item in context from the page
    */
    public String contextItem{get;set;}


    /*
    *   set controller
    */
    private ApexPages.StandardSetController setCon;
   
   
    /*
    *   the contact ids selected by the user
    */
    private Set<Id> selectedContactIds;
   
   
    /*
    *   constructor
    */
    public CCW_ContactPaginationController ()
    {
      GetAccount = new Asset();    //Get Account Id from Page
      GetContract = new Asset();   //Get Contract Name from Page  
      GetExpireDate = new Asset();   // Date Picker  
      GetReseller = new Asset();
      GetDistributor = new Asset(); 
      GetOpportunity = new Asset();   // Get Opportunity Id
      GetNewOpportunity = new Asset();  // Get New Opportunity Name      
      fetch_data();       
     }
   
  // public List<Asset> Asset_yourObjList{get;set;}
    
   public void fetch_data ()
   {
      
        //init variable
        this.selectedContactIds= new Set<Id>();
        //gather data set
       
         If ( GetAccount.AccountId == NULL || GetContract.Name == NULL )
         {  
           If ( PageContractId <> NULL )
           {
           Contract C;
           C = [SELECT Name FROM Contract WHERE Id = :PageContractId Limit 1];
           this.setCon = new ApexPages.StandardSetController( [SELECT AccountId,Product2Id,SerialNumber,last_contract_number__c,Service_Start_Date_Min__c, Service_End_Date_Max__c,InstallDate FROM Asset WHERE last_contract_number__c = :C.Name Order by Service_End_Date_Max__c Desc  Limit 1000] );
                     }
           else If ( PageAccountId <> NULL )
           {
           this.setCon = new ApexPages.StandardSetController( [SELECT AccountId,Product2Id,SerialNumber,last_contract_number__c,Service_Start_Date_Min__c, Service_End_Date_Max__c,InstallDate FROM Asset WHERE AccountId = :PageAccountId Order by Service_End_Date_Max__c Desc   Limit 1000] );
                     }  
         }
        
          If ( GetAccount.AccountId <> NULL && GetContract.Name == NULL )
          { 
           this.setCon = new ApexPages.StandardSetController( [SELECT AccountId,Product2Id,SerialNumber,last_contract_number__c,Service_Start_Date_Min__c, Service_End_Date_Max__c,InstallDate FROM Asset WHERE AccountId = :GetAccount.AccountId Order by Service_End_Date_Max__c Desc  Limit 1000] );
                    }
          Else If ( GetContract.Name <> NULL && GetAccount.AccountId == NULL )
          {
           this.setCon = new ApexPages.StandardSetController( [SELECT AccountId,Product2Id,SerialNumber,last_contract_number__c,Service_Start_Date_Min__c, Service_End_Date_Max__c,InstallDate FROM Asset WHERE last_contract_number__c  = :GetContract.Name Order by Service_End_Date_Max__c Desc  Limit 1000] );
                    } 
         Else If ( GetAccount.AccountId <> NULL && GetContract.Name <> NULL )
          {
         this.setCon = new ApexPages.StandardSetController( [SELECT AccountId,Product2Id,SerialNumber,last_contract_number__c,Service_Start_Date_Min__c, Service_End_Date_Max__c,InstallDate FROM Asset WHERE AccountId = :GetAccount.AccountId and last_contract_number__c = :GetContract.Name  Order by Service_End_Date_Max__c Desc  Limit 1000] );
                   }                                    
        this.setCon.setpageNumber(1);
        this.setCon.setPageSize(10);     
                  
   }
  
      
    /*
    *   handle item selected
    */
    public void doSelectItem(){       
        this.selectedContactIds.add(this.contextItem);       
    }
   
   
    /*
    *   handle item deselected
    */
    public void doDeselectItem(){       
        this.selectedContactIds.remove(this.contextItem);       
    }
   
   
    /*
    *   return count of selected items
    */
    public Integer getSelectedCount(){
       
        return this.selectedContactIds.size();
       
    }
   
   
    /*
    *   advance to next page
    */
    public void doNext(){
       
        if(this.setCon.getHasNext())
            this.setCon.next();

    }
   
   
    /*
    *   advance to previous page
    */
    public void doPrevious(){
       
        if(this.setCon.getHasPrevious())
            this.setCon.previous();
               
    }
   
    //public List<CCWRowItem> rows = new List<CCWRowItem>();
   
    public List<CCWRowItem> rows {get; set;}
    /*
    *   return current page of groups
    */
    public List<CCWRowItem> getContacts(){       
       
        rows = new List<CCWRowItem>();
       
        for(sObject r : this.setCon.getRecords()){
            Asset c = (Asset)r;
           
            CCWRowItem row = new CCWRowItem(c);
            if(this.selectedContactIds.contains(c.Id)){
                row.IsSelected=true;
            }
            else{
                row.IsSelected=false;
            }
            rows.add(row);           
        }
               
        return rows;
       
    }
 
// Store Selected Records to Object/Table
public void processSelected() {
    Integer currentPageNumber = setCon.getPageNumber();
    selectedAssets = new List<Asset>();
    list<Temp_Assets__c> TempAssetList = new list<Temp_Assets__c>();   
       
    /*    for(CCWRowItem wrapAssetObj : rows  ) {
          if(wrapAssetObj.IsSelected == true) {
             selectedAssets.add(wrapAssetObj.tContact);
           } 
        } */
       
     setCon.setpageNumber(1);

while(true){
    List<Asset>  TempAssetLists = (List<Asset>)setCon.getRecords();
    for(Asset assetIns : TempAssetLists  ) {
          if(this.selectedContactIds.contains(assetIns.Id)){
             selectedAssets.add(assetIns);
           }
     }
if(setCon.getHasNext()){
  setCon.next();
  }
  else{
  break;
  }
  
} 
        /**********Added by Unnat*********************************/
        //below code should only execute if Expiry term has a value
        Date maxDate=Date.valueOf('2000-1-1');
        //Calculate the maximum Date off of the selected dates
        //if (Expiry_term !=null {
       
            //finds the latest expiry date out of the selected assets
            for (Asset assets: selectedAssets) {
                if(assets.Service_End_Date_Max__c > maxDate) {
                    maxDate=assets.Service_End_Date_Max__c;
                }
            }
            //There will be another condition to add the expiry term to the latest expiry date
            /*if (expiry_term== '1 Year') {
                maxDate=maxDate.addYears(1).addDays(1);
            }
            else if (expiry_term == '3 Year') {
                maxDate=maxDate.addYears(3).addDays(1);
            }
            else if (expirty_term == '5 Year') {
                maxDate=maxDate.addYears(5).addDays(1);
            }
        }
        else {
            maxDate= expiry_date;  
        } */
        /****************Completed by Unnat*****************************/
       Account ResellerAct;
       Account DistributorAct; 
       Opportunity Oppt;
             
       

      
      

        
       for(Asset Act : selectedAssets)
            {              
              Temp_Assets__c TempAsset = new Temp_Assets__c();
              TempAsset.Name = 'Sudhir';
              TempAsset.AccountId__c = Act.AccountId;
              TempAsset.Product__c = Act.Product2Id;
              TempAsset.Serial_Number__c = Act.SerialNumber;
              TempAsset.Last_Contract_Number__c = Act.last_contract_number__c;
              TempAsset.Service_Start_Date__c = Act.Service_Start_Date_Min__c;
              TempAsset.Service_End_Date__c = Act.Service_End_Date_Max__c;
              //TempAsset.Service_End_Date__c = maxDate;
              TempAsset.Install_Date__c = Act.InstallDate; 
               If (GetReseller.AccountId <> NULL)
               {     
                ResellerAct = [ SELECT Id FROM Account WHERE ID = :GetReseller.AccountId Limit 1];
                TempAsset.Reseller__c = ResellerAct.Id;
                }
               If (GetDistributor.AccountId <> NULL )
                {
                DistributorAct = [ SELECT Id FROM Account WHERE ID = :GetDistributor.AccountId Limit 1];
                TempAsset.Distributor__c = DistributorAct.Id;
                }
               If ( GetOpportunity.Opportunity__c <> NULL )
                {
                Oppt = [SELECT Id FROM Opportunity WHERE ID = :GetOpportunity.Opportunity__c Limit 1];
                TempAsset.Existing_Opportunity__c = Oppt.Id;
                }               
              TempAsset.Incumbent_Reseller__c = IncumbentReseller;
              TempAsset.Education__c = Education;
              TempAsset.Expiry_Date__c = GetExpireDate.Expire_Date__c;
             
              TempAsset.New_Opportunity__c = GetNewOpportunity.New_Opportunity__c;
              TempAsset.Expiry_Term__c = ExpireTerms;
              //Add the selected Assets to the List
              TempAssetList.add(TempAsset);
            }
           
        Insert TempAssetList; 
       
        setCon.setpageNumber(currentPageNumber);
       
    } 
   
    /*
    *   return whether previous page exists
    */
    public Boolean getHasPrevious(){
       
        return this.setCon.getHasPrevious();
       
    }
   
   
    /*
    *   return whether next page exists
    */
    public Boolean getHasNext(){
       
        return this.setCon.getHasNext();
   
    }
   
   
    /*
    *   return page number
    */
    public Integer getPageNumber(){
       
        return this.setCon.getPageNumber();
       
    }
   
   
    /*
    *    return total pages
    */
    Public Integer getTotalPages(){
   
        Decimal totalSize = this.setCon.getResultSize();
        Decimal pageSize = this.setCon.getPageSize();
       
        Decimal pages = totalSize/pageSize;
       
        return (Integer)pages.round(System.RoundingMode.CEILING);
    }
   
   
   
    /*
    *   helper class that represents a row
    */
    public with sharing class CCWRowItem{
       
        public Asset tContact{get;set;}
        public Boolean IsSelected{get;set;}
       
        public CCWRowItem(Asset c){
            this.tContact=c;
            this.IsSelected=false;
        }
       
    }
 
      
    
   
}

Thanks

Sudhir