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Serializing drop-down list data sources in Session State

Hello,

I have several drop-down lists on my ASP.NET page. I need to keep data
sources of these lists in Session State.
What would be the most effective method to serialize this kind of data
structures?

Thanks for any hints,
Leszek Taratuta
Nov 18 '05 #1
13 5267
Use DataTable or HashTable, they are serializable.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
Hello,

I have several drop-down lists on my ASP.NET page. I need to keep data
sources of these lists in Session State.
What would be the most effective method to serialize this kind of data
structures?

Thanks for any hints,
Leszek Taratuta

Nov 18 '05 #2
Thanks, but this what I have already tried. The problem is the ListItem
class is not serializable.

I have created my own ListItem-like class (serializable) and copied
drop-down list data sources (using my ListItem class) to ArrayLists. Then I
put the array lists into a hash table with keys as drop-down lists' ids.
This solution does not work. When I try to deserialize such a structure,
..NET gives me an exception that the type version has been changed and it is
not possible to deserialize data. I think the type is too complex for
serialization (custom ListItem-like objects within ArrayLists within a
Hashtable).

Any other suggestions,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:O1******** ******@TK2MSFTN GP10.phx.gbl...
Use DataTable or HashTable, they are serializable.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
Hello,

I have several drop-down lists on my ASP.NET page. I need to keep data
sources of these lists in Session State.
What would be the most effective method to serialize this kind of data
structures?

Thanks for any hints,
Leszek Taratuta


Nov 18 '05 #3
You didn't say you wanted to serialize Controls, you said you wanted to
serialize the DataSource that you're binding to. A ListItem is a UI Control,
and there's no need (or even a good reason) to serialize it. Just store the
DataTable in Session and bind to it.

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OA******** ******@TK2MSFTN GP10.phx.gbl...
Thanks, but this what I have already tried. The problem is the ListItem
class is not serializable.

I have created my own ListItem-like class (serializable) and copied
drop-down list data sources (using my ListItem class) to ArrayLists. Then I put the array lists into a hash table with keys as drop-down lists' ids.
This solution does not work. When I try to deserialize such a structure,
.NET gives me an exception that the type version has been changed and it is not possible to deserialize data. I think the type is too complex for
serialization (custom ListItem-like objects within ArrayLists within a
Hashtable).

Any other suggestions,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:O1******** ******@TK2MSFTN GP10.phx.gbl...
Use DataTable or HashTable, they are serializable.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
Hello,

I have several drop-down lists on my ASP.NET page. I need to keep data
sources of these lists in Session State.
What would be the most effective method to serialize this kind of data
structures?

Thanks for any hints,
Leszek Taratuta



Nov 18 '05 #4
Live sample:

(If this ddl doesn't depend on specific user, store it in Application or
Cache):

const string SOURCE_NAME = "SourceName ";
private DataTable GetThatFreaking Source()
{
if(Application[SOURCE_NAME] == null)
{
DataTable tbl = GetThatTableFro mDbOrSomething( );
Application[SOURCE_NAME] = tbl;
return tbl;
}
return (DataTable)Appl ication[SOURCE_NAME];
}
private void BindThatDdl()
{
ddl.DataSource = GetThatFreaking Source();
ddl.DataBind();
}

Done. In sort, when you box Application[SOURCE_NAME] to DataTable (last line
in the first method) that's where serilization takes place. Automatically.

Enjoy :)
"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OA******** ********@TK2MSF TNGP10.phx.gbl. ..
Thanks, but this what I have already tried. The problem is the ListItem
class is not serializable.

I have created my own ListItem-like class (serializable) and copied
drop-down list data sources (using my ListItem class) to ArrayLists. Then
I
put the array lists into a hash table with keys as drop-down lists' ids.
This solution does not work. When I try to deserialize such a structure,
.NET gives me an exception that the type version has been changed and it
is
not possible to deserialize data. I think the type is too complex for
serialization (custom ListItem-like objects within ArrayLists within a
Hashtable).

Any other suggestions,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:O1******** ******@TK2MSFTN GP10.phx.gbl...
Use DataTable or HashTable, they are serializable.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
> Hello,
>
> I have several drop-down lists on my ASP.NET page. I need to keep data
> sources of these lists in Session State.
> What would be the most effective method to serialize this kind of data
> structures?
>
> Thanks for any hints,
> Leszek Taratuta
>
>



Nov 18 '05 #5
Thanks. I forgot the ListItems are controls.
The situation is that my data sources are not DataTables. I have ArrayLists
filled with ListItems.
The problem is I cannot serialize this kind of ArrayLists to session state
kept in state server.

Thanks,
Leszek

"Kevin Spencer" <ks******@takem pis.com> wrote in message
news:uC******** *****@TK2MSFTNG P10.phx.gbl...
You didn't say you wanted to serialize Controls, you said you wanted to
serialize the DataSource that you're binding to. A ListItem is a UI Control, and there's no need (or even a good reason) to serialize it. Just store the DataTable in Session and bind to it.

--
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OA******** ******@TK2MSFTN GP10.phx.gbl...
Thanks, but this what I have already tried. The problem is the ListItem
class is not serializable.

I have created my own ListItem-like class (serializable) and copied
drop-down list data sources (using my ListItem class) to ArrayLists.
Then I
put the array lists into a hash table with keys as drop-down lists' ids.
This solution does not work. When I try to deserialize such a structure,
.NET gives me an exception that the type version has been changed and it

is
not possible to deserialize data. I think the type is too complex for
serialization (custom ListItem-like objects within ArrayLists within a
Hashtable).

Any other suggestions,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:O1******** ******@TK2MSFTN GP10.phx.gbl...
Use DataTable or HashTable, they are serializable.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
> Hello,
>
> I have several drop-down lists on my ASP.NET page. I need to keep data > sources of these lists in Session State.
> What would be the most effective method to serialize this kind of data > structures?
>
> Thanks for any hints,
> Leszek Taratuta
>
>



Nov 18 '05 #6
I think you complicate things for no obvious reason :) I may be totally
wrong, it all depends on particular situation, but this is what it seems
like. Much easier to store data in serializable object like DataTable and
then keep it on server, even if that would require to put your data in such
table first.
"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OE******** ******@tk2msftn gp13.phx.gbl...
Thanks. I forgot the ListItems are controls.
The situation is that my data sources are not DataTables. I have
ArrayLists
filled with ListItems.
The problem is I cannot serialize this kind of ArrayLists to session state
kept in state server.

Thanks,
Leszek

"Kevin Spencer" <ks******@takem pis.com> wrote in message
news:uC******** *****@TK2MSFTNG P10.phx.gbl...
You didn't say you wanted to serialize Controls, you said you wanted to
serialize the DataSource that you're binding to. A ListItem is a UI

Control,
and there's no need (or even a good reason) to serialize it. Just store

the
DataTable in Session and bind to it.

--
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OA******** ******@TK2MSFTN GP10.phx.gbl...
> Thanks, but this what I have already tried. The problem is the ListItem
> class is not serializable.
>
> I have created my own ListItem-like class (serializable) and copied
> drop-down list data sources (using my ListItem class) to ArrayLists. Then
I
> put the array lists into a hash table with keys as drop-down lists'
> ids.
> This solution does not work. When I try to deserialize such a
> structure,
> .NET gives me an exception that the type version has been changed and
> it

is
> not possible to deserialize data. I think the type is too complex for
> serialization (custom ListItem-like objects within ArrayLists within a
> Hashtable).
>
> Any other suggestions,
> Leszek
>
> "Kikoz" <ki***@hotmail. com> wrote in message
> news:O1******** ******@TK2MSFTN GP10.phx.gbl...
> > Use DataTable or HashTable, they are serializable.
> >
> > "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
> > news:%2******** **********@TK2M SFTNGP09.phx.gb l...
> > > Hello,
> > >
> > > I have several drop-down lists on my ASP.NET page. I need to keep

data > > > sources of these lists in Session State.
> > > What would be the most effective method to serialize this kind of data > > > structures?
> > >
> > > Thanks for any hints,
> > > Leszek Taratuta
> > >
> > >
> >
> >
>
>



Nov 18 '05 #7
Well, I know it is much easier to store data in serializable object like
DataTable but I work in a team, and what I receive from the data layer is
ArrayList containing ListItems.
For now the only resonable solution is to convert the ArrayLists to
DataTables. It is not efficient though. I thought it would be any other more
appropriate way to store this kind of data. Any kind of serialization from
ArrayLists to strings or so, and then deserialization .

Thanks,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:Ob******** ******@TK2MSFTN GP10.phx.gbl...
I think you complicate things for no obvious reason :) I may be totally
wrong, it all depends on particular situation, but this is what it seems
like. Much easier to store data in serializable object like DataTable and
then keep it on server, even if that would require to put your data in such table first.
"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OE******** ******@tk2msftn gp13.phx.gbl...
Thanks. I forgot the ListItems are controls.
The situation is that my data sources are not DataTables. I have
ArrayLists
filled with ListItems.
The problem is I cannot serialize this kind of ArrayLists to session state kept in state server.

Thanks,
Leszek

"Kevin Spencer" <ks******@takem pis.com> wrote in message
news:uC******** *****@TK2MSFTNG P10.phx.gbl...
You didn't say you wanted to serialize Controls, you said you wanted to
serialize the DataSource that you're binding to. A ListItem is a UI

Control,
and there's no need (or even a good reason) to serialize it. Just store

the
DataTable in Session and bind to it.

--
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OA******** ******@TK2MSFTN GP10.phx.gbl...
> Thanks, but this what I have already tried. The problem is the ListItem > class is not serializable.
>
> I have created my own ListItem-like class (serializable) and copied
> drop-down list data sources (using my ListItem class) to ArrayLists.

Then
I
> put the array lists into a hash table with keys as drop-down lists'
> ids.
> This solution does not work. When I try to deserialize such a
> structure,
> .NET gives me an exception that the type version has been changed and
> it
is
> not possible to deserialize data. I think the type is too complex for
> serialization (custom ListItem-like objects within ArrayLists within a > Hashtable).
>
> Any other suggestions,
> Leszek
>
> "Kikoz" <ki***@hotmail. com> wrote in message
> news:O1******** ******@TK2MSFTN GP10.phx.gbl...
> > Use DataTable or HashTable, they are serializable.
> >
> > "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
> > news:%2******** **********@TK2M SFTNGP09.phx.gb l...
> > > Hello,
> > >
> > > I have several drop-down lists on my ASP.NET page. I need to keep

data
> > > sources of these lists in Session State.
> > > What would be the most effective method to serialize this kind of

data
> > > structures?
> > >
> > > Thanks for any hints,
> > > Leszek Taratuta
> > >
> > >
> >
> >
>
>



Nov 18 '05 #8
Well, Leszek, it seems that the wrong person is asking this question of the
newsgroup. Whoever is sending you ArrayLists of ListItems is the one who
needs the help!

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:#A******** ******@TK2MSFTN GP10.phx.gbl...
Well, I know it is much easier to store data in serializable object like
DataTable but I work in a team, and what I receive from the data layer is
ArrayList containing ListItems.
For now the only resonable solution is to convert the ArrayLists to
DataTables. It is not efficient though. I thought it would be any other more appropriate way to store this kind of data. Any kind of serialization from
ArrayLists to strings or so, and then deserialization .

Thanks,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:Ob******** ******@TK2MSFTN GP10.phx.gbl...
I think you complicate things for no obvious reason :) I may be totally
wrong, it all depends on particular situation, but this is what it seems
like. Much easier to store data in serializable object like DataTable and
then keep it on server, even if that would require to put your data in such
table first.
"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OE******** ******@tk2msftn gp13.phx.gbl...
Thanks. I forgot the ListItems are controls.
The situation is that my data sources are not DataTables. I have
ArrayLists
filled with ListItems.
The problem is I cannot serialize this kind of ArrayLists to session

state kept in state server.

Thanks,
Leszek

"Kevin Spencer" <ks******@takem pis.com> wrote in message
news:uC******** *****@TK2MSFTNG P10.phx.gbl...
> You didn't say you wanted to serialize Controls, you said you wanted to> serialize the DataSource that you're binding to. A ListItem is a UI
Control,
> and there's no need (or even a good reason) to serialize it. Just store the
> DataTable in Session and bind to it.
>
> --
> HTH,
> Kevin Spencer
> .Net Developer
> Microsoft MVP
> Neither a follower
> nor a lender be.
>
> "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
> news:OA******** ******@TK2MSFTN GP10.phx.gbl...
> > Thanks, but this what I have already tried. The problem is the ListItem> > class is not serializable.
> >
> > I have created my own ListItem-like class (serializable) and copied
> > drop-down list data sources (using my ListItem class) to ArrayLists. Then
> I
> > put the array lists into a hash table with keys as drop-down lists'
> > ids.
> > This solution does not work. When I try to deserialize such a
> > structure,
> > .NET gives me an exception that the type version has been changed and> > it
> is
> > not possible to deserialize data. I think the type is too complex for> > serialization (custom ListItem-like objects within ArrayLists within a
> > Hashtable).
> >
> > Any other suggestions,
> > Leszek
> >
> > "Kikoz" <ki***@hotmail. com> wrote in message
> > news:O1******** ******@TK2MSFTN GP10.phx.gbl...
> > > Use DataTable or HashTable, they are serializable.
> > >
> > > "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
> > > news:%2******** **********@TK2M SFTNGP09.phx.gb l...
> > > > Hello,
> > > >
> > > > I have several drop-down lists on my ASP.NET page. I need to

keep data
> > > > sources of these lists in Session State.
> > > > What would be the most effective method to serialize this kind of data
> > > > structures?
> > > >
> > > > Thanks for any hints,
> > > > Leszek Taratuta
> > > >
> > > >
> > >
> > >
> >
> >
>
>



Nov 18 '05 #9
Thank you. I am going to talk with the guy who creates the data layer.

BTW
What could be the best alternative to get drop-down list data sources from
the data layer? DataTables are pretty heavy. Any other possibilities.

Thanks,

Leszek

"Kevin Spencer" <ks******@takem pis.com> wrote in message
news:#r******** ******@TK2MSFTN GP11.phx.gbl...
Well, Leszek, it seems that the wrong person is asking this question of the newsgroup. Whoever is sending you ArrayLists of ListItems is the one who
needs the help!

--
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Neither a follower
nor a lender be.

"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:#A******** ******@TK2MSFTN GP10.phx.gbl...
Well, I know it is much easier to store data in serializable object like
DataTable but I work in a team, and what I receive from the data layer is
ArrayList containing ListItems.
For now the only resonable solution is to convert the ArrayLists to
DataTables. It is not efficient though. I thought it would be any other more
appropriate way to store this kind of data. Any kind of serialization from ArrayLists to strings or so, and then deserialization .

Thanks,
Leszek

"Kikoz" <ki***@hotmail. com> wrote in message
news:Ob******** ******@TK2MSFTN GP10.phx.gbl...
I think you complicate things for no obvious reason :) I may be totally wrong, it all depends on particular situation, but this is what it seems like. Much easier to store data in serializable object like DataTable

and then keep it on server, even if that would require to put your data in

such
table first.
"Leszek Taratuta" <ad*@taratuta.n et> wrote in message
news:OE******** ******@tk2msftn gp13.phx.gbl...
> Thanks. I forgot the ListItems are controls.
> The situation is that my data sources are not DataTables. I have
> ArrayLists
> filled with ListItems.
> The problem is I cannot serialize this kind of ArrayLists to session

state
> kept in state server.
>
> Thanks,
> Leszek
>
> "Kevin Spencer" <ks******@takem pis.com> wrote in message
> news:uC******** *****@TK2MSFTNG P10.phx.gbl...
>> You didn't say you wanted to serialize Controls, you said you wanted to
>> serialize the DataSource that you're binding to. A ListItem is a UI
> Control,
>> and there's no need (or even a good reason) to serialize it. Just store > the
>> DataTable in Session and bind to it.
>>
>> --
>> HTH,
>> Kevin Spencer
>> .Net Developer
>> Microsoft MVP
>> Neither a follower
>> nor a lender be.
>>
>> "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
>> news:OA******** ******@TK2MSFTN GP10.phx.gbl...
>> > Thanks, but this what I have already tried. The problem is the ListItem
>> > class is not serializable.
>> >
>> > I have created my own ListItem-like class (serializable) and
copied >> > drop-down list data sources (using my ListItem class) to

ArrayLists. > Then
>> I
>> > put the array lists into a hash table with keys as drop-down lists' >> > ids.
>> > This solution does not work. When I try to deserialize such a
>> > structure,
>> > .NET gives me an exception that the type version has been changed and >> > it
>> is
>> > not possible to deserialize data. I think the type is too complex for >> > serialization (custom ListItem-like objects within ArrayLists within
a
>> > Hashtable).
>> >
>> > Any other suggestions,
>> > Leszek
>> >
>> > "Kikoz" <ki***@hotmail. com> wrote in message
>> > news:O1******** ******@TK2MSFTN GP10.phx.gbl...
>> > > Use DataTable or HashTable, they are serializable.
>> > >
>> > > "Leszek Taratuta" <ad*@taratuta.n et> wrote in message
>> > > news:%2******** **********@TK2M SFTNGP09.phx.gb l...
>> > > > Hello,
>> > > >
>> > > > I have several drop-down lists on my ASP.NET page. I need to

keep > data
>> > > > sources of these lists in Session State.
>> > > > What would be the most effective method to serialize this
kind of > data
>> > > > structures?
>> > > >
>> > > > Thanks for any hints,
>> > > > Leszek Taratuta
>> > > >
>> > > >
>> > >
>> > >
>> >
>> >
>>
>>
>
>



Nov 18 '05 #10

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Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
10420
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
9582
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
5996
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4619
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
4225
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

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