I'm clearly missing something simple. I have a web form that I'd like to use for new sales as well as editing existing sales. My page load looks like this:

    protected void Page_Load(object sender, EventArgs e)
    {
//      EventGolf oEvent = new Wala.Membership.Business.EventGolf();
//      mmBindingList<EventGolfEntity> oGolfEvents = oEvent.GetAllEntities();   
        this.oOrder = (Reg_Golf)this.RegisterBizObj(new Reg_Golf());
        this.oFee = (Fee)this.RegisterBizObj(new Fee());
        this.iContactId = int.Parse(String.IsNullOrEmpty(Request.QueryString["ContactId"]) ? "0" : Request.QueryString["ContactId"]);

        this.iOrderId = int.Parse(String.IsNullOrEmpty(Request.QueryString["OrderId"]) ? "0" : Request.QueryString["OrderId"]);
        
        // Retrieve the specified order and detail
        if (! this.oOrder.getOrderById(this.iOrderId))
        {
            this.oOrder.NewEntity();
            this.oOrder.Entity.numIndID = this.iContactId;
        }
        Session["dsOrder"] = this.oOrder.DataSet;

My save button is defined like this:

 <mm:mmButton ID="btnSave" runat="server" AccessLevel="Full" BindingSource="" BindingSourceMember=""
            ControlID="00000000-0000-0000-0000-000000000000" IsPostBack="False" SecuritySetup="True"
            Text="Save Sale" UserFieldName="" onclick="btnSave_Click" 
                    UseSubmitBehavior="False" />

Note that useSubmitBehavior and isPostBack are false. When I click on the save button, it's still posting back, which is wiping out my Session["dsOrder"]. Then it's running the btnSave_Click method which is trying to save a null datasession.

So, what am I missing?

Thanks!

Eric