Re: Muliple Users aspx project
From: John Saunders (johnwsaundersiii)
Date: 12/11/04
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Date: Sat, 11 Dec 2004 16:08:27 -0500
<grizduck@comcast.net> wrote in message
news:1102797107.968088.215990@z14g2000cwz.googlegroups.com...
> so, on webform1 I can "declare" the variable like this
>
> session("FirstName") = txtfirstname.text
>
> and then display it on , say, page 4 with
>
> lblfirstname.text = session("FirstName")?
>
> also, can you calculate with these variables like
>
> session("Subtotal") = session("Integer1") * session("Integer2")?
No, because "*" is not a valid operator for the Object type.
You'll need
Session("Subtotal") = DirectCast(Session("Integer1"), Integer) *
DirectCast(Session("Integer2"), Integer)
You _are_ running with Options Strict On, aren't you?
John Saunders
> Thanks again
> John Saunders wrote:
>> <grizduck@comcast.net> wrote in message
>> news:1102755030.897956.181340@f14g2000cwb.googlegroups.com...
>> > This is very helpful. I have one question though. Where do i
> declare
>> > the session variables? Since I ran into this problem, I have been
>> > reading many groups and researching the problem. Do I declare the
>> > variables in global.asax or on each webform? Thanks in advance.
>>
>> You don't have to declare them at all. They're not "variables",
> really.
>>
>> "Session" (aka Page.Session, or Page.Context.Session) is an instance
> of the
>> HttpSessionState class. You can treat it as a collection of
> name-value
>> pairs. You can set a value with syntax like
>>
>> Session("FirstName") = TheFirstNameValue
>>
>> and then you can retrieve it with
>>
>> Dim o As Object = Session("FirstName")
>>
>> Note that Session(string) returns an Object, so you'll have to cast
> it to
>> the correct type:
>>
>> Dim s As String = DirectCast(Session("FirstName"), String)
>>
>> Note the use of DirectCast, which is correct since you know that it's
> a
>> string (you put it there, after all). Do not use CType or ToString in
> these
>> cases, as though you didn't know what type of value you put there.
>>
>> Note also that this is subject to spelling errors -
> Session("FirstNam") will
>> return Nothing. I usually solve this problem by wrapping session
> state in a
>> class and using properties of the class to access it:
>>
>> Public Class UserState
>> ...
>> Public Shared Property FirstName As String
>> Get
>> Return
> DirectCast(HttpContext.Current.Session("FirstName"),
>> String)
>> End Get
>> Set(ByVal Value As String)
>> HttpContext.Current.Session("FirstName") = Value
>> End Set
>> End Property
>> ...
>> End Class
>>
>> This way, there are only two places for a typo to happen. I would
> access
>> this from a page as UserState.FirstName. This can be accessed from
> multiple
>> pages.
>>
>> BTW, Note the use of HttpContext.Current.Session. Since class
> UserState
>> isn't a Page, it doesn't have a "Session" member, so the Shared
> HttpContext
>> member "Current" is used to access the current request context.
>>
>>
>> John Saunders
>
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