Request.Form

[rn5a]

Consider the following 2 code snippets:

-----------------------------------------------
<script runat="server">
Dim strName As String =
System.Web.HttpContext.Current.Request.Form("txtName")

Sub Page_Load(......)
.................
.................
End Sub

'some more Subs here
</script>
-----------------------------------------------


-----------------------------------------------
<script runat="server">
Dim strName As String = Request.Form("txtName")

Sub Page_Load(......)
.................
.................
End Sub

'some more Subs here
</script>
-----------------------------------------------

Note that in both the code snippets, the variable strName has been
declared & assigned a value outside any sub-routine.

The first code snippet works fine but the second code snippet
generates the following error:

**********************
Request is not available in this context.
**********************

pointing to the Dim strName... line. Can someone please explain me why
does the second code snippet generate the above error & why does the
first code snippet work fine?

Thanks.........

 

[Ben]

Dim strName As String = Request.Form("txtName")


This statement will be compiled to execute in the class constructor. At
contruction time the Page class (the aspx page is conpiled into a class
deriving from Page) property 'Request' is not set yet, but is still
null. So accessing by calling Request.Form("txtName") will throw an
exception.

The Page.Request property is only set after the contructor has run (in
AsyncPageBeginProcessRequest).

System.Web.HttpContext.Current.Request.Form("txtName")

This just uses a static property of a differnt class, so it's available
in the Page constructor.

hth

Ben