Rick,
>Ok.... so how would the Page_Load know what it was that got it there?
>If I wanted the Page_Load to know what it was that got it there, would I have to set a session variable in the Post-back event AND call Page_Load from within my Post-back event?
>
I don't know the answer to your question about knowing what caused the post back. I'm not sure how or if you can do that. But, you might already know that you can check IsPostBack and do conditional processing in the page load. If not...here is an example.

// are we posting back?
if(IsPostBack)
     // check the session variable that you set
     string myvar = Session["myvar"].ToString()
     
     // do your processing...