[SalesForce] File Attachment Upload – Maximum View State Size limit (135kB)exceeded

I have used simple code to upload File.

Now My page is giving me the following error:

Maximum view state size limit (135KB) exceeded. Actual view state size for this page was 838.719KB

• I have tried making all variables Transient
• Removed PageBlock

Instead of coming on this error page – I want to show an Error Message like "Too big File. Upload files having size less than 2 MB."

How can I achieve this. Any Help or Any other suggestions ?

Visualforce Code :

    <apex:page standardController="Contact" showHeader="true" extensions="PhotoUploadController">
  <apex:sectionHeader title="Upload photo of {!obj.name}"/>   
    <apex:form >
    <apex:pagemessages />
        <br/>
        <apex:outputText ><b>1. Select the photo</b></apex:outputText><br/><br/> &nbsp; &nbsp; &nbsp;
        <apex:outputText > Click the <b>"Choose File" </b>to find the photo.</apex:outputText><br/><br/>&nbsp; &nbsp; &nbsp;
        <apex:inputFile title="Upload Photo" contentType="{!objAttach.ContentType}" value="{!objAttach.body}" fileName="{!objAttach.name}" id="file"></apex:inputFile>
        <br/><br/><br/>
        <apex:outputText><b>2. Upload Photo</b></apex:outputText><br/><br/>&nbsp; &nbsp; &nbsp;
        <apex:outputText >Click the <b>"Upload Photo"</b> button.</apex:outputText><br/><br/>&nbsp; &nbsp; &nbsp;
        <apex:commandButton value="Upload Photo" action="{!savePhoto}"/><br/><br/>
    </apex:form>   
</apex:page>

Controller Code :

public with sharing class PhotoUploadController {
    public Attachment objAttach{  get {
                                        if(objAttach== null)
                                          objAttach= new Attachment();
                                        return objAttach;
                                     }
                                   set;
                                 }

    transient Public Contact obj{get;set;}

     public PhotoUploadController(ApexPages.StandardController controller){
        objAttach=new Attachment();
        obj= (Contact)controller.getRecord();
        if(obj.id!=null){
            obj= [select id,name from Contact where id=:obj.id];
        }
     }

     public pageReference savePhoto(){  
        try {
                transient String contentType=objAttach.ContentType;

                if(contentType == 'image/jpeg' || contentType== 'image/png' ){

                    if(objAttach.body!=null && objAttach.name!=null){
                        objAttach.parentId=obj.id;                       
                        try {
                             upsert objAttach;
                             obj.Image_URL__c=URL.getSalesforceBaseUrl().toExternalForm()+'/servlet/servlet.FileDownload?file='+objAttach.id;
                             objAttach =null;
                             upsert obj;
                             obj=null;
                        }catch (DMLException e) {
                            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Error uploading attachment'));
                            return null;
                        }finally {
                          objAttach.body = null;
                        }    
                  }
                  return new pagereference('/'+obj.id);                  
                }else{
                      ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Please, Upload image file with extension .JPG or .PNG'));
                      return null;
               }
           }
           catch(Exception e){
                 ApexPages.addMessages(e);
                 return null;
           }               
     }
}