ViewStateStudy_controller

public with sharing class ViewStateStudy_controller {

    public String accId{get;set;}
    public Account account{get;set;}

    public ViewStateStudy_controller()
    {
       accId = ApexPages.currentPage().getParameters().get('Id'); 
       if(accId != null)        
        {
            this.account= [   SELECT  Name
                          FROM    Account
                          WHERE   Id = : accId ];  
        }
        else
        {
            this.account= new Account();

        }   
    }
    public pageReference save()
    {
        insert this.account;
        return null;    
    }
	public pageReference saveandclose()
	{
	    insert this.account;
		//technically this works, but is not a best practice. 
	    PageReference pageRef = new PageReference('/apex/test');
	    pageRef.setRedirect(true);
	    return pageRef;   
	
	}

	public PageReference page2(){
		return Page.ViewStateStudy_page2;	
	}

	public PageReference page2byGet(){
		//this way will force initial page request by GET thus dumping view state
		//usually this would be used to reset or cancel a set of page flows. 
		PageReference pageRef = Page.ViewStateStudy_page2;
		pageRef.setRedirect(true);
		return pageRef;	
	}


	public PageReference page1(){
		return Page.ViewStateStudy_page1;	
	}
}

ViewStateStudy_page1

<apex:page controller="ViewStateStudy_controller">
<apex:form >
<apex:actionRegion >
<apex:pageBlock id="pbAccountDetails">
    <apex:pageBlockSection columns="1" collapsible="false">
    <apex:inputField value="{!account.Name}" required="true" />
    <!--<apex:inputfield value="{!account.Email__c}" required="true"/>-->   
</apex:pageBlockSection>    
<apex:pageBlockButtons >
     <apex:commandButton action="{!save}" value="Save"/>
    <apex:commandButton action="{!saveandclose}" value="Save and Close" immediate="true"/>  
    <apex:commandButton action="{!page2}" value="Next"/>
    <apex:commandButton action="{!page2byGet}" value="Next by Get"/>
    
</apex:pageBlockButtons>


</apex:pageBlock>
</apex:actionRegion>
</apex:form>

</apex:page>

ViewStateStudy_page2

<apex:page controller="ViewStateStudy_controller" >
	<apex:form >
	<apex:pageBlock >
		<apex:pageBlockButtons >
			<apex:commandButton action="{!page1}" value="Previous" />
		</apex:pageBlockButtons>
		<apex:pageBlockSection >
			<apex:outputField value="{!account.Name}"/>
		</apex:pageBlockSection>
	</apex:pageBlock>
	</apex:form>
</apex:page>