Wizard:

Wizard:
Salesforce wizard is a good example to understand the view state.Please check the view state once you done.You can get UtilityJS Here

public class JobAppWizard {

    // These properties will be used to maintain state
 
    // Search results are not transient in case the user accidentally selects
    // the wrong one and wants to go back
    public List<Candidate__c> results {
    get{
    if(results == null) results = new List<Candidate__c>();
        return results;
    }
    set;
    }
 
    public ApexPages.standardController controller {get; set;}
 
    public String searchText {
    get;
    set{
    value = value.endsWith('*') ? value : value + '*';
            searchText = value;
    }
    }
 
    public Boolean showSearch {
    get{
    if (showSearch == null) showSearch = true;
    return showSearch;
    }
    set;
    }

    public Job_Application__c jobApplication { get; set; }
 
    public Candidate__c candidate {
    get{
            if (candidate == null) candidate = new Candidate__c();
            return candidate;
    }
    set;
    }
 
    public ID candidateId { get; set; }
 
    public JobAppWizard(ApexPages.StandardController stdController) {
    // constructor
    controller = stdController;
        this.jobApplication = (Job_Application__c)stdController.getRecord();
        if ((ApexPages.currentPage().getParameters().get('posId') != null)&&
            (ApexPages.currentPage().getParameters().get('posId') != '')){
        jobApplication.Position__c = ApexPages.currentPage().getParameters().get('posId');
        }
    }
     
    // The next 3 methods control navigation through
    // the wizard. Each returns a PageReference for one of the 3 pages
    // in the wizard. Note that the redirect attribute does not need to
    // be set on the PageReference because the URL does not need to change
    // when users move from page to page.
    public PageReference step1() {
        return Page.jobAppStep1;
    }
    public PageReference step2() {
    return Page.jobAppStep2;
    }
    public PageReference step3() {
    if (candidate.last_name__c == null){
    candidate.last_name__c.addError('Last Name is required');
    return null;
    } else {
    return Page.jobAppStep3;
    }
    }
 
    // this function is called by step2 & step3 pages in the action attribute,
    // in case anyone tries to go directly to them it will navigate the user back to step1
    public PageReference checkPosition(){
    if (jobApplication.Position__c == null) {
    PageReference newRef = Page.jobAppStep1;
    newRef.setRedirect(true);
    return newRef;
    } else {
    return null;
    }
    }
   
    public PageReference doSearch() {
        results = (List<Candidate__c>)[FIND :searchText IN ALL FIELDS RETURNING Candidate__c(Id, First_Name__c, Last_Name__c, Email__c, City__c, State_Province__c, Phone__c)] [0];
        return null;
    }
 
    // doing a separate query here to keep the view state down
    public PageReference SelectCandidate() {  
        candidate = [select id,first_name__c,last_name__c,phone__c,email__c,mobile__c, street_address_1__c,street_address_2__c,city__c,state_province__c,zip_postal_code__c,country__c from Candidate__c where id=:candidateId];
        return Page.jobAppStep3;
    }
 
    public PageReference NewCandidate(){
    if (!showSearch) {
    candidate = new Candidate__c();
    candidateId = null; // reset the id so we know what to do upon save
    }
    return null;
    }
       
        public PageReference save() {
        // catches need to return null; redo using ApexPages.addMessages(e) & <apex:pageMessages>
        if (candidateId == null) {
        // it's a brand spanking new candidate so we need to insert it first
        try{
        insert candidate;
        System.debug('new candidate=' + candidate);
        } catch (System.DmlException e) {
ApexPages.addMessages(e);
return null;
        }
        }
        System.debug('jobApplication=' + jobApplication);
        jobApplication.Candidate__c = candidate.id;
        try{
        insert jobApplication;
        } catch (System.DmlException e) {
ApexPages.addMessages(e);
return null;
    }
        controller = new ApexPages.standardController(jobApplication);
        return controller.view();
        }
}
and the step 1 page looks like this

<apex:page standardController="Job_Application__c" extensions="JobAppWizard" tabStyle="Job_Application__c">
  <apex:includeScript value="{!$Resource.utilityJS}" />
  <apex:sectionHeader title="Job Application" subtitle="Step 1 of 3"/>
  <apex:form >
      <apex:pageBlock id="theBlock" title="Job Application Edit" mode="edit">
          <apex:pageBlockButtons >
              <apex:commandButton action="{!step2}" value="Next"/>
              <apex:commandButton action="{!cancel}" value="Cancel" onclick="return confirmCancel()" immediate="true" style="margin-left: 2em"/>
          </apex:pageBlockButtons>
          <apex:pageBlockSection title="Information" columns="1">
              <apex:inputField value="{!JobApplication.Status__c}"/>
              <apex:inputField value="{!JobApplication.Stage__c}"/>
              <apex:inputField value="{!JobApplication.Position__c}" required="true"/>
          </apex:pageBlockSection>
      </apex:pageBlock>
  </apex:form>
</apex:page>
Step 2 page :

<apex:page standardController="Job_Application__c" extensions="JobAppWizard" tabStyle="Job_Application__c" action="{!checkPosition}">
  <apex:includeScript value="{!$Resource.utilityJS}" />
  <apex:sectionHeader title="Job Application" subtitle="Step 2 of 3"/>
  <apex:form id="theForm" >
      <apex:pageBlock id="theRadioBlock" title="Choose" mode="edit">
          <apex:pageMessages />
          <apex:pageBlockButtons location="top" >
              <apex:commandButton action="{!step1}" value="Previous"/>
              <apex:commandButton action="{!step3}" value="Next" rendered="{!NOT(ShowSearch)}"/>
              <apex:commandButton action="{!cancel}" value="Cancel" onclick="return confirmCancel()" immediate="true" style="margin-left: 2em"/>
          </apex:pageBlockButtons>
          <apex:pageBlockSection collapsible="false" title="Search or New" id="searchOrNew" columns="1">
              <apex:selectRadio value="{!ShowSearch}">
                  <apex:selectOption itemValue="true" itemLabel="Search for Existing Candidate"/>
                  <apex:selectOption itemValue="false" itemLabel="Create New Candidate" />
                  <apex:actionSupport rerender="theForm" event="onclick" action="{!NewCandidate}"/>
              </apex:selectRadio>
          </apex:pageBlockSection>
      </apex:pageBlock>
      <apex:pageBlock id="theSearchBlock" title="Specify Candidate" mode="edit" rendered="{!ShowSearch}">
          <apex:pageBlockButtons location="bottom" >
              <apex:commandButton action="{!step1}" value="Previous"/>
              <apex:commandButton action="{!step3}" value="Next" rendered="{!NOT(ShowSearch)}"/>
          </apex:pageBlockButtons>
          <apex:pageBlockSection title="Candidate Search" collapsible="false" id="candSearch" columns="1">
              <apex:outputPanel layout="searchBlock" style="padding:5px 0px;margin-bottom:5px;background-color:#D9D9D9">
                    <apex:outputLabel style="padding:0px 5px;font-size:95%;font-weight:bold;font-family: 'Verdana','Geneva',sans-serif;" value="Enter Candidate Last Name" for="searchText"/>                                      
                    <apex:inputText id="searchText" value="{!searchText}" size="50" />
                    <apex:commandButton value="Search" action="{!doSearch}" rerender="results" status="status"/>
                    <apex:actionStatus id="status" startText="requesting..."/>
              </apex:outputPanel>  
          </apex:pageBlockSection>
          <apex:pageBlockSection title="Candidate Search Results" id="results" columns="1" collapsible="false" >
              <apex:pageBlockTable value="{!results}" var="c" id="thePBTable" >  
                  <apex:column headerValue="Action">
                      <apex:commandLink action="{!SelectCandidate}" value="Select" >
                        <apex:param name="a" assignTo="{!candidateId}" value="{!c.Id}"/>
                      </apex:commandLink>
                  </apex:column>          
                  <apex:column value="{!c.First_Name__c}"/>
                  <apex:column value="{!c.Last_Name__c}"/>
                  <apex:column value="{!c.Email__c}"/>
                  <apex:column value="{!c.Phone__c}"/>
                  <apex:column value="{!c.City__c}"/>
                  <apex:column value="{!c.State_Province__c}"/>
              </apex:pageBlockTable>
         </apex:pageBlockSection>
       </apex:pageBlock>
       <apex:pageBlock id="theCandidateBlock" title="New Candidate" mode="edit" rendered="{!NOT(ShowSearch)}">
          <apex:pageBlockButtons location="bottom" >
              <apex:commandButton action="{!step1}" value="Previous"/>
              <apex:commandButton action="{!step3}" value="Next"/>
          </apex:pageBlockButtons>            
          <apex:pageBlockSection title="Candidate Information" columns="2" id="candInfo" collapsible="false">
              <apex:inputField value="{!Candidate.First_Name__c}"/>
              <apex:inputField value="{!Candidate.Phone__c}"/>
              <apex:inputField value="{!Candidate.Last_Name__c}" />
              <apex:inputField value="{!Candidate.Mobile__c}"/>
              <apex:pageBlockSectionItem >
                  <apex:outputText value=""/>
              </apex:pageBlockSectionItem>
              <apex:inputField value="{!Candidate.Email__c}" />    
          </apex:pageBlockSection>  
          <apex:pageBlockSection title="Address Info" columns="1">
              <apex:inputField value="{!Candidate.Street_Address_1__c}"/>
              <apex:inputField value="{!Candidate.Street_Address_2__c}" />
              <apex:inputField value="{!Candidate.City__c}"/>
              <apex:inputField value="{!Candidate.State_Province__c}"/>
              <apex:inputField value="{!Candidate.Zip_Postal_Code__c}"/>
          </apex:pageBlockSection>
      </apex:pageBlock>
  </apex:form>
</apex:page>
Step 3 Page:

<apex:page standardController="Job_Application__c" extensions="JobAppWizard" tabStyle="Job_Application__c" action="{!checkPosition}">
  <apex:includeScript value="{!$Resource.utilityJS}" />
  <apex:sectionHeader title="Job Application" subtitle="Step 3 of 3"/>
  <apex:form >
      <apex:pageBlock id="theBlock" title="Job Application and Candidate" mode="detail">
          <apex:pageBlockButtons >
              <apex:commandButton action="{!step2}" value="Previous"/>
              <apex:commandButton action="{!save}" value="Save"/>
              <apex:commandButton action="{!cancel}" value="Cancel" onclick="return confirmCancel()" immediate="true" style="margin-left: 2em"/>
          </apex:pageBlockButtons>
          <apex:pageMessages />
          <apex:pageBlockSection title="Job Application" columns="1" collapsible="false">
              <apex:outputField value="{!JobApplication.Status__c}"/>
              <apex:outputField value="{!JobApplication.Stage__c}"/>
              <apex:outputField value="{!JobApplication.Position__c}"/>
          </apex:pageBlockSection>                    
          <apex:pageBlockSection title="Candidate Information" columns="2" id="candInfo" collapsible="false">
              <apex:outputField value="{!Candidate.First_Name__c}"/>
              <apex:outputField value="{!Candidate.Phone__c}"/>
              <apex:outputField value="{!Candidate.Last_Name__c}" />
              <apex:outputField value="{!Candidate.Mobile__c}"/>
              <apex:pageBlockSectionItem >
                  <apex:outputText value=""/>
              </apex:pageBlockSectionItem>
              <apex:outputField value="{!Candidate.Email__c}" />    
              <apex:pageBlockSectionItem >
                  <apex:outputText value=""/>
              </apex:pageBlockSectionItem>
          </apex:pageBlockSection>  
          <apex:pageBlockSection showHeader="false" columns="1">
              <apex:outputField value="{!Candidate.Street_Address_1__c}"/>
              <apex:outputField value="{!Candidate.Street_Address_2__c}" />
              <apex:outputField value="{!Candidate.City__c}"/>
              <apex:outputField value="{!Candidate.State_Province__c}"/>
              <apex:outputField value="{!Candidate.Zip_Postal_Code__c}"/>
          </apex:pageBlockSection>  
      </apex:pageBlock>
  </apex:form>
</apex:page>