Confused in use of EnableviewState="true"

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C#

ASP.NET

C#4.0

Hi Guys

I have 2 pages. Page_1 and Page_2.

In Page_1 I EneableViewstate="true" on top of the page.
Also Page_1 has a link that redirects to Page_2.

the code for Page_Load() of Page_1 is below.

if (!Page.IsPostBack)
            {
               loadgrdAvailableStaffOnPageLoad();
               loadgrvViewAppointmentsOnPageLoad();
            }
            else if (Page.IsPostBack)
            {
                loadgrdAvailableStaffOnPageLoadViewState();
                loadgrvViewAppointmentsOnPageLoadViewState();
            }

In Page_2 I have button "cancel" with this code below

Response.Redirect("Page_1.aspx");// So it goes to Page_1

Now correct me if am wrong because am confuse.

On initial Page_Load() am expecting the application to go inside this "if" statement below:

if (!Page.IsPostBack)
            {
               loadgrdAvailableStaffOnPageLoad();
               loadgrvViewAppointmentsOnPageLoad();
            }

Then after coming back from Page_2, the application should be loading

this part:

else if (Page.IsPostBack)
            {
                loadgrdAvailableStaffOnPageLoadViewState();
                loadgrvViewAppointmentsOnPageLoadViewState();
            }

What can I do to restore Page_1 information after coming back from Page_2??