Asp.Net pass data from code-behind to code-infront? - asp.net

Question

I have this in my code behind on my Asp.Net page
Public Class display
Inherits System.Web.UI.Page
Protected Property pID As String
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.QueryString("id") = "") Then
Response.Redirect("Default.aspx")
Else
pID = Request.QueryString("id")
End If
End Sub
End Class
Now, I want to get the ID to influence items in the code infront when the page loads, so i added this:
<asp:Label ID="Label1" runat="server" Text='<%# pID %>'></asp:Label>
as a test object. when ran 'Label1' is just a blank span. what am i doing wrong?

Answer 1

You don't need <%# pID %>, Just use
Label1.Text = pID
As Label1 is a server control and is accessible in page load.
Change your code as
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.QueryString("id") = "") Then
Response.Redirect("Default.aspx")
Else
pID = Request.QueryString("id")
Label1.Text = pID
End If
End Sub
EDIT:
I would suggest you to use LinkButton
<asp:LinkButton OnClick="LinkButton_Click" />
CS Code
Sub LinkButton_Click(sender As Object, e As EventArgs)
Response.Redirect(piccom.displayLink(pID))
End Sub

Answer 2

Keep things simple and organized like #saptal is suggesting.
pID = Request.QueryString("id")
Label1.Text = pID
If you need an anchor control you can use the HyperLink control like this on your markup:
<asp:HyperLink ID ="genHyperLink" CssClass="genLink" runat="server" />
code behind:
genHyperLink.NavigateUrl = piccom.displayLink(pID)