Asp.Net将数据从后台代码传递到后台代码？

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)