ASP Net - Casting a Request.Form control from Code Behind

Question

This seems really simple, but for some reason Im stumped..

Im dynamically generating an HTML Select Box, lets call it myselect. Im creating this select box based on some database values Im generating an HTML Select Box.. almost like a string that Im just spitting out to the page. So it's never a control in the codebehind, just part of a string thats rendered as HTML by the browser. If I submit my form, and in my codebehind I perform:

Dim myVal as String = Request.Form("myselect")

That code will give me the VALUE of the myselect select box. How can I refer to this control to cast it as a System.Web.UI.HtmlControls.HtmlSelect control? Request.Form seems to give me the value, but I want to reference the object itself..

Answer 1

If your dynamically generating the control in your code file, then it will not be available to you on post back. As long as you generate it again before the viewstate is processed (you can do it in your oninit), then you can access it as you would anything else.

MySelect.SelectedValue

Answer 2

If this select box isn't declared statically on your page (that is, you're adding it to the Control Collection), you'll have to do something like this: Dim MySelect as HtmlSelect = Page.FindControl("MySelect") as HtmlSelect

You'll have to forgive me if my casting syntax is a bit off -- I'm used to casting in C#.

Answer 3

In response to the comments above (thanks for your help), I found what Gabriel McAdams and jwiscarson had to say were true. In browsing the Request object, I found that its nothing more than a collection of key\\value pairs. Performing Request.Form("myformobj") will return a value, because thats all thats available to the application. If necessary, I suppose I can whip up some nifty javascript to track form object types, but it's certainly not necessary in my case.

Thanks for the help