Problem w/ session var being incremented on reload

Storm · October 13th, 2004, 01:42 AM

Hello,
I was running the "session.aspx" example from "Beginning ASP.NET using VB.NET", Ch 10, and came across some strange/unexpected behavior. If the basket has a non-zero item count and the page is then reloaded, the item count gets automatically incremented. It seems as if the AddClick handler is being fired on reload. It does not do this if the item count is zero. Can anyone tell me why is this happening and how I can stop it from doing this? The something similar happens with Exercise 4 (another shopping cart page). Any help would be appreciated, as I'm really stumped on this.

Thanks in advance,
Storm

Relevent Code:

Code:

<%@ Page language="VB"%>
<SCRIPT language="vb" runat="server">

Sub EmptyClick(Sender as System.Object, E As System.EventArgs)
    Session("BasketCount") = 0
End Sub


Sub AddClick(Sender as System.Object, E As System.EventArgs)
        Session("BasketCount") += 1
End Sub

</SCRIPT>

<HTML>
<HEAD>
    <LINK href="../General.css" rel="stylesheet">
    <TITLE>Session Example</TITLE>
</HEAD>
<BODY>
<FORM id="BasketForm" method="post" runat="server">
    <ASP:button id="btnEmpty" text="Empty" onClick="EmptyClick" runat="server" />
    <BR/>
    <ASP:button id="btnAdd" text="Add" onClick="AddClick" runat="server" />
    <BR/>
    Basket Items: <%=Session("BasketCount") %>
    <BR/>
</FORM>
</BODY>
</HTML>