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9 Items, 1 Pages 1 |< << Go >> >|

	WhatThe12
	Asp.Net User

Accessing Session from within a web control

8/6/2005 4:24:01 PM

0/0

Hi,

Is it considered bad design to have a web control depend on Session state? I mean have properties which get their value from Session instead of, say, Viewstate.

Cheers,

WT.

Web dev - spending forever achieving nothing.

	joteke
	Asp.Net User

Re: Accessing Session from within a web control

8/6/2005 5:03:08 PM

0/0

Hi,

if thinking generally, yes it is bit bad, because it assumes that session is always in use in the web app where the control is used in. What if it isn't available for some scenarios? Another thing is that it adds quite burden to the server, because session state doesn't get GC's & collected after you leave the page (like Viewstate does), but it's there for the entire session (basically user is also tied to one instance of the same control on one page, especially dangerous if controls themselves set something to the session as well because they could override each other's values as they share the same session variable).

So if you need something to the control from the session, let the control take it via a property and the setter (e.g the Page) takes care of where that value comes from, e.g deals with the session, that's my recommendation.

However, I wouldn't say that you couldn't use it if it solves a specific problem and won't cause problems e.g you've been thinking carefully that it's the only way. But you've been warned. :-)

Thanks,

Teemu Keiski
Finland, EU

	WhatThe12
	Asp.Net User

Re: Accessing Session from within a web control

8/6/2005 7:44:05 PM

0/0

That makes sense. Thanks.

Web dev - spending forever achieving nothing.

	WhatThe12
	Asp.Net User

Re: Accessing Session from within a web control

8/6/2005 8:55:10 PM

0/0

"basically user is also tied to one instance of the same control on one page, especially dangerous if controls themselves set something to the session as well because they could override each other's values as they share the same session variable"

You could make the session key depend on the unique ID or a GUID.

Web dev - spending forever achieving nothing.

	joteke
	Asp.Net User

Re: Accessing Session from within a web control

8/7/2005 6:48:49 AM

0/0

WhatThe12 wrote:
"basically user is also tied to one instance of the same control on one page, especially dangerous if controls themselves set something to the session as well because they could override each other's values as they share the same session variable"

You could make the session key depend on the unique ID or a GUID.

Sure but that would make it even worse, from resource use viewpoint, if you reuse (and probably you will) the same control in the app within the same session. You multiply the use of the session variables. E.g multitude of ViewState parameters but scope being session. :-)

Thanks,

Teemu Keiski
Finland, EU

	defaulk
	Asp.Net User

Re: Accessing Session from within a web control

8/19/2005 4:02:37 PM

0/0

I hope you don't mind if I resurrect this discussion. I do find it necessary in my case to create a control that stores information in the session.

(If you don't care about the reason, just skip this paragraph.) My control creates a table plus other information based upon a sql statement. At the bottom of this table, there is supposed to be a link offering a csv download of the information in the table. Since the SQL is ad hoc from the control's perspective, it needs to store that SQL in a way that the csv generating asp page can be aware of the SQL, run the query and generate. The logical choice would be for the control to hold that sql in the session using a key that is built from a guid. Then in the csv generating page, I can reference the session information using that key in order to retrieve the SQL.

So anyway, it's important for me to be able to access the session from the control itself. How do I do this?

	joteke
	Asp.Net User

Re: Accessing Session from within a web control

8/19/2005 4:14:29 PM

0/0

defaulk wrote:
I hope you don't mind if I resurrect this discussion. I do find it necessary in my case to create a control that stores information in the session.

(If you don't care about the reason, just skip this paragraph.) My control creates a table plus other information based upon a sql statement. At the bottom of this table, there is supposed to be a link offering a csv download of the information in the table. Since the SQL is ad hoc from the control's perspective, it needs to store that SQL in a way that the csv generating asp page can be aware of the SQL, run the query and generate. The logical choice would be for the control to hold that sql in the session using a key that is built from a guid. Then in the csv generating page, I can reference the session information using that key in order to retrieve the SQL.

So anyway, it's important for me to be able to access the session from the control itself. How do I do this?

Controls have always Context property which repressents the current HttpContext (all relevant data related to the request going on). Therefore accessing Session could be

[C#]
Context.Session["key"] = "value";

[VB]
Context.Session("key") = "value"

Thanks,

Teemu Keiski
Finland, EU

	WhatThe12
	Asp.Net User

Re: Accessing Session from within a web control

9/18/2005 4:43:48 PM

0/0

Can't the page containing the control be responsible for storing the required information in session?

Web dev - spending forever achieving nothing.

	joteke
	Asp.Net User

Re: Accessing Session from within a web control

9/19/2005 5:21:48 AM

0/0

WhatThe12 wrote:
Can't the page containing the control be responsible for storing the required information in session?

LIke I said in some previous reply

So if you need something to the control from the session, let the control take it via a property and the setter (e.g the Page) takes care of where that value comes from, e.g deals with the session, that's my recommendation.

That would be ideal solution, if session is needed (my opinion)

Thanks,

Teemu Keiski
Finland, EU

9 Items, 1 Pages 1 |< << Go >> >|

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