Hi all

I have created a class for uplaoding file and its working fine.but when i am uploading more than 135KB file its throwing error like Maximum view state size limit (128K) exceeded.Problem is when system admin uplaod more than 135 KB file it has been uploaded but on other profile it is showing this type of error.how to achieve this ...

public with sharing class CCW_UploadFileController {
 
    /*
    *   attachment
    */
    public Purchase_Order__c purchaseOrder{get;set;}
    public Attachment tAttachment{get;set;}
    public boolean showC1RecordType {get;set;}
    public boolean showC2RecordType {get;set;} 
    
    private Id c1RecordTypeId; 
    private Id c2RecordTypeId;
    
 
    /*
    *   constructor
    */
    public CCW_UploadFileController(ApexPages.StandardController controller)
    {
 
        //initialize attachment container
        this.tAttachment = new Attachment();
        c1RecordTypeId = Schema.SObjectType.Purchase_Order__c.getRecordTypeInfosByName().get('C1').getRecordTypeId();
        c2RecordTypeId = Schema.SObjectType.Purchase_Order__c.getRecordTypeInfosByName().get('C2').getRecordTypeId();
        
        purchaseOrder = new Purchase_Order__c();
        purchaseOrder = (Purchase_Order__c)controller.getRecord();
         
        String isButtonClicked = Apexpages.currentPage().getParameters().get('setDefaultValues');
        if(isButtonClicked == 'true'){
            setDefaultValues();
        }
        
        showC1RecordType = false;
        showC2RecordType = false;
        tAttachment= new Attachment();
        
        
        if(purchaseOrder.RecordTypeId == c1RecordTypeId){
            showC1RecordType = true;
            showC2RecordType = false;
        }
        else if(purchaseOrder.RecordTypeId == c2RecordTypeId){
            showC1RecordType = false;
            showC2RecordType = true;
        }
        
    }
    
     public void setDefaultValues(){
        String quoteId = Apexpages.currentPage().getParameters().get('quoteId');
        Quote__c quote = [Select o.id, o.name, o.Quantity_formula__c, o.Opportunity_Product_Detail__r.Opportunity__c,
                    o.Opportunity__c, o.Record_type_name__c,o.Company_Name__c,Opportunity_Product_Detail__r.Opportunity__r.Account__c from Quote__c o WHERE O.id=:quoteId];
        //system.assert(false,quote);     
        purchaseOrder.Opportunity__c = quote.Opportunity_Product_Detail__r.Opportunity__c;
        purchaseOrder.Quote__c = quote.id;
        purchaseOrder.Company__c = quote.Opportunity_Product_Detail__r.Opportunity__r.Account__c;
        
        if(quote.Record_type_name__c == 'C1'){
            purchaseOrder.RecordTypeId = c1RecordTypeId;
        }
        else {
            purchaseOrder.RecordTypeId = c2RecordTypeId;
        }
    }
 
    
 
    /*
    *   upload file
    */
    public PageReference doUploadFile(){
 
        if(tAttachment.Body == null){
            Apexpages.addMessage(new Apexpages.Message(Apexpages.Severity.ERROR, 'Please upload recent Purchase Order  before saving the record'));
            return null;
        }
        else{
            try{
                insert purchaseOrder;
                
              tAttachment.OwnerId = UserInfo.getUserId();
               tAttachment.ParentId = purchaseOrder.id;
              insert tAttachment;
                
                
                return new PageReference('/'+purchaseOrder.id);
            }
            catch(DMLException e){
                ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,e.getMessage()));
                return null;
            }
        }
    }
}

<apex:page standardController="Purchase_Order__c" extensions="CCW_UploadFileController">
    <apex:sectionHeader title="Sale Confirmation Orders" subtitle="{!purchaseOrder.Name}" />
      <apex:form enctype="multipart/form-data">
        <apex:pageMessages ></apex:pageMessages>
        <apex:pageBlock title="Sale Confirmation Order Edit">
            <apex:pageBlockButtons >
                <apex:commandButton action="{!doUploadFile}" value="Save"/>
                <apex:commandButton action="{!cancel}" value="Cancel"/>
            </apex:pageBlockButtons>
            
            <apex:pageBlockSection title="Information" columns="2" collapsible="false" rendered="{!showC1RecordType}">
                <apex:inputField value="{!purchaseOrder.Opportunity__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Number__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.GRN_needed_for_Bill_Processing__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Date__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.No_of_Days_for_collecting_GRN__c}"/>
                <apex:inputField value="{!purchaseOrder.Committed_Dispatch_Date__c}" required="true"/>
               
              
                <apex:inputField value="{!purchaseOrder.Purchase_Frequency__c}" required="true" />
                <apex:inputField value="{!purchaseOrder.Customer_Ordered_Quantity__c}" required="true" />
                 <apex:inputField value="{!purchaseOrder.Pre_shipment_Inspection_required__c}" required="true" />
                
                   
                    <apex:inputField value="{!purchaseOrder.Customer_Price__c}"/>
                    
                     <apex:inputField value="{!purchaseOrder.Credit_Limit__c}"/>
                    <apex:inputField value="{!purchaseOrder.Bill_Submission_Period__c}"/> 
               <apex:inputField value="{!purchaseOrder.CurrencyIsoCode}"/>
                
               
                <!---<apex:inputField value="{!purchaseOrder.New_Flash_Aidc_Email_sent__c}"/>--->
               
               
               <!--- <apex:inputField value="{!purchaseOrder.New_Flash_Email_sent__c}"/>--->
                
              
               <!-- <apex:inputField value="{!purchaseOrder.PO_Uploaded__c}"/>
                <apex:inputField value="{!purchaseOrder.Try__c}"/>
                <apex:inputField value="{!purchaseOrder.CountAttachment__c}"/>--->
            </apex:PageBlockSection>
            
            <apex:pageBlockSection title="Information" columns="2" collapsible="false" rendered="{!showC2RecordType}">
                <!---<apex:inputField value="{!purchaseOrder.Opportunity__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Number__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.GRN_needed_for_Bill_Processing__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Date__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.No_of_Days_for_collecting_GRN__c}"/>
                <apex:inputField value="{!purchaseOrder.Committed_Dispatch_Date__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.Credit_Limit__c}"/>
                <apex:inputField value="{!purchaseOrder.Customer_Ordered_Quantity__c}"/>
                <apex:inputField value="{!purchaseOrder.CurrencyIsoCode}"/>
                <apex:inputField value="{!purchaseOrder.Customer_Price__c}"/>
                <apex:inputField value="{!purchaseOrder.Purchase_Frequency__c}" required="true" />
                <apex:inputField value="{!purchaseOrder.Bill_Submission_Period__c}"/>--->
                   <!---<apex:inputField value="{!purchaseOrder.Application_Area__c}"/>
               
            <apex:inputField value="{!purchaseOrder.CountAttachment__c}"/>
                <apex:inputField value="{!purchaseOrder.Try__c}"/>
                <apex:inputField value="{!purchaseOrder.New_Flash_Email_sent__c}"/>
                 <apex:inputField value="{!purchaseOrder.New_Flash_Aidc_Email_sent__c}"/>---->
                 
                 
                 <apex:inputField value="{!purchaseOrder.Opportunity__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Number__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.GRN_needed_for_Bill_Processing__c}"/>
                <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Date__c}" required="true"/>
                <apex:inputField value="{!purchaseOrder.No_of_Days_for_collecting_GRN__c}"/>
                <apex:inputField value="{!purchaseOrder.Committed_Dispatch_Date__c}" required="true"/>
               
              <!--- <apex:inputField value="{!purchaseOrder.Sale_Confirmation_Order_Number__c}"  required="true"/>--->
                <apex:inputField value="{!purchaseOrder.Purchase_Frequency__c}" required="true" />
                <apex:inputField value="{!purchaseOrder.Customer_Ordered_Quantity__c}" required="true" />
                 <apex:inputField value="{!purchaseOrder.Pre_shipment_Inspection_required__c}" required="true" />
                
                   
                    <apex:inputField value="{!purchaseOrder.Customer_Price__c}"/>
                    
                     <apex:inputField value="{!purchaseOrder.Credit_Limit__c}"/>
                    <apex:inputField value="{!purchaseOrder.Bill_Submission_Period__c}"/> 
               <apex:inputField value="{!purchaseOrder.CurrencyIsoCode}"/>
                
            </apex:PageBlockSection>
            
            <apex:pageBlockSection title="Quote Details" columns="1" collapsible="false">
                <apex:inputField value="{!purchaseOrder.Quote__c}"/>
                <apex:inputField value="{!purchaseOrder.Company__c}"/>
                 <apex:inputField value="{!purchaseOrder.Delivery_Address__c}" required="true" />
            </apex:PageBlockSection>
            
            <apex:pageBlockSection title="New Flash Details" columns="2" collapsible="false" >
            
            
            
        <apex:inputField value="{!purchaseOrder.Application_Area__c}"   />
                       
              
                <apex:inputField value="{!purchaseOrder.Remarks__c}"/>
      

                                        
            </apex:PageBlockSection>
            
            <apex:pageBlockSection title="Upload Purchase Order" columns="2" collapsible="false">
                <apex:pageBlockSectionItem >
                <apex:outputLabel value="File" for="file" />
                
            <apex:inputFile value="{!tAttachment.Body}" filename="{!tAttachment.Name}" filesize="{!tAttachment.BodyLength}" contentType="{!tAttachment.ContentType}" />
          
                </apex:pageBlockSectionItem>
            </apex:PageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>