Help needed with module

I'm working on a simple module, but I'm having some trouble with the scope of variables, and the firing of events.

My module has a single view and nothing else.  The form is test.ascx and the codebehind page is test.ascx.cs.

My question is:  Why when clicking buttons is myPhase continually being set to zero?  What would I do to save the value of phase during the life of this page?

Test.ascx:

< %@ Control Language="C#" AutoEventWireup="true" CodeFile="Test.ascx.cs"
    Inherits="Test" % >
< asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" UseSubmitBehavior="False" / >
< br / >
< br / >
< br / >
< asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" UseSubmitBehavior="False" / >
< br / >
< br / >
< br / >
< asp:Label ID="Label1" runat="server" Text="Label">

test.ascx.cs:

using System;
using System.Data;

public partial class Test : DotNetNuke.Entities.Modules.PortalModuleBase
{
    public int myPhase;


    private void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            myPhase = 1;
        }

    }


    protected void Button1_Click(object sender, EventArgs e)
    {
        myPhase += 1;
        UpdateLabel();

    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        myPhase += 2;
        UpdateLabel();
    }

    protected void UpdateLabel()
    {
        Label1.Text = myPhase.ToString();
    }

}

You probably want MyPhase to be a private variable.  That will insure that it only gets updates from the button clicks.

If you want it to maintain state between post-backs, then you should use viewstate.  A Static variable will also work to hold the value across round-trips, but you may get unwanted results because it becomes a "Global" variable that way.

public partial class Test : DotNetNuke.Entities.Modules.PortalModuleBase
{


    private void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState("myPhase") = 1;
        }

    }


    protected void Button1_Click(object sender, EventArgs e)
    {

       ViewState("myPhase")  = Convert.ToInteger(ViewState("myPhase") )+ 1;
        UpdateLabel();

    }