On Demand Loading of a control

You can dynamically load the UserControl whenever you want... or after you sessions are initialize:


Add this line in your ASPX HTML
<%@ Reference Control = "UserControl1.ascx" %>


And then in code Add this after you initialize sessions

UserControl1 uc1 = (UserControl1) Page.LoadControl("UserControl1.ascx");
PlaceHolder1.Controls.Add(uc1);

-tushar

Ok...I'm a little new on this concept. I'm using vb so I assume I declare the control in the declarations as control, right. Then what do you mean by Placeholder1?  Also, what is uc1 referencing?

You can declare it as the way I showed.

Then what do you mean by Placeholder1?
--> PlaceHolder1 is WebControl if you BrowsYour WebControl you'll see "PlaceHolder" in them.
--> Drag and drop PlaceHolder1 wherever you want to put your UserControl

UC1
--> UserControl1 is the Name of you Control and uc1 is Object of that control

But, I think the 2nd option will be lot easier to deal with if you can adapt that..

-tusahr

So if I was to use the second option....sorry to be so dense, but what does "Response.redirect(request.RawURL) do?  And this code would reside in the ascx page load???

Response.Redirect  : Will Redirect you to URL that is passed as Argument
Request.RawUrl      : Will Give you current URL of page.

You need call Response.Redirect( Request.RawUrl ) after you have Set your Session variable.

"the parent page needs to save data and then set a session variable which passes to the control"
--> Set Session Variable and then use Response.Redirct to Re-load page

.. Page_Load(..)
{
   if( Session["YourSessionName"] == null )
   {
       SaveData();
       Session["YourSessionName"] = "SetSession";
       Response.Redirect( Request.RawUrl );
   }
}

ps. You should always check that Session Variable are not null before using them anywhere.

-tushar

The only disadvantage that I can see with this, is that the control will still load first and am trying to get around that, if possible.

Alright in that case
- Put PlaceHolder/Panel wherever you want to show UserControl
- After you Set your session add following line:

Dim uc1 As UserControl1 = CType(Page.LoadControl("UserControl1.ascx"), UserControl1)
PlaceHolder1.Controls.Add(uc1)

[ Replace UserControl1 with name of your UserControl.
     i.e. if your UserControl is Header.ascx then replace "UserControl1" with "Header" ]

-tushar