How to declare a variable in the global scope?

[Miguel Dias Moura]

Hello,

I am working on an ASP.NET / VB page and I created a variable "query":

Sub Page_Load(sende r As Object, e As System.EventArg s)
Dim query as String = String.Empty
...
query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
End Sub

I need "query" to be global and accessible everywhere.
How can I do this?

Thanks,
Miguel

[Saravana]

If you want query variable to be accessed in all the pages then declare that
variable in application scope or put it in cache.

--
Saravana
http://dotnetjunkies.com/WebLog/saravana/
www.ExtremeExperts.com
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl...

Hello,

I am working on an ASP.NET / VB page and I created a variable "query":

Sub Page_Load(sende r As Object, e As System.EventArg s)
Dim query as String = String.Empty
...
query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
End Sub

I need "query" to be global and accessible everywhere.
How can I do this?

Thanks,
Miguel

[Steve C. Orr [MVP, MCSD]]

With a web app, generally your global variables should be stored in the
Application Object or Cache object. This way they are explicity made
accessible to all code in your app.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl...

Hello,

I am working on an ASP.NET / VB page and I created a variable "query":

Sub Page_Load(sende r As Object, e As System.EventArg s)
Dim query as String = String.Empty
...
query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query End
Sub

I need "query" to be global and accessible everywhere.
How can I do this?

Thanks,
Miguel

[Miguel Dias Moura]

Hello,

Can you tell me how to store the global variables in the Application
Object?
What should the code be and where should I place it?

I am just starting with ASP.NET.

Thanks,
Miguel

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:St***@Orr. net:

With a web app, generally your global variables should be stored in the
Application Object or Cache object. This way they are explicity made
accessible to all code in your app.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message

news:OP******** ******@TK2MSFTN GP09.phx.gbl...

Hello,

I am working on an ASP.NET / VB page and I created a variable "query":

Sub Page_Load(sende r As Object, e As System.EventArg s)
Dim query as String = String.Empty
...
query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query End

Sub

I need "query" to be global and accessible everywhere.
How can I do this?

Thanks,
Miguel

[Juan T. Llibre]

You could also insert a key in the application's
web.config and read it whenever you need it.

First, include this in your web.config :

<appSettings>
<add key="query1" value="SELECT * FROM dbo.documents WHERE"/>
</appSettings>

Then, retrieve it with this :

Dim query1 As String = System.Configur ation.Configura tionSettings.Ap pSettings("quer y1")

The value for query1 will be available at the Application scope level.
Values read from the web.config file are always of type String.

This method has the advantage that you can have multiple
queries stored in web.config, to be used as needed.


Juan T. Llibre
===========
"Saravana" <sa******@sct.c o.in> wrote in message
news:4m******** *********@news. cpqcorp.net...

If you want query variable to be accessed in all the pages then declare
that
variable in application scope or put it in cache.

--
Saravana
http://dotnetjunkies.com/WebLog/saravana/
www.ExtremeExperts.com
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl...

Hello,

I am working on an ASP.NET / VB page and I created a variable "query":

Sub Page_Load(sende r As Object, e As System.EventArg s)
Dim query as String = String.Empty
...
query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
End Sub

I need "query" to be global and accessible everywhere.
How can I do this?

Thanks,
Miguel

[Steve C. Orr [MVP, MCSD]]

'To store a variable:
Application.Loc k()
Application("My Var")="whatever "
Application.Unl ock()

'to retrieve the variable:
Dim s as String = Application("My Var").ToString( )

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Hello,

Can you tell me how to store the global variables in the Application
Object?
What should the code be and where should I place it?

I am just starting with ASP.NET.

Thanks,
Miguel

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:St***@Orr. net:

With a web app, generally your global variables should be stored in the
Application Object or Cache object. This way they are explicity made
accessible to all code in your app.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message

news:OP******** ******@TK2MSFTN GP09.phx.gbl...

> Hello,
>
> I am working on an ASP.NET / VB page and I created a variable "query":
>
> Sub Page_Load(sende r As Object, e As System.EventArg s)
> Dim query as String = String.Empty
> ...
> query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
> End
>
> Sub
>
> I need "query" to be global and accessible everywhere.
> How can I do this?
>
> Thanks,
> Miguel
>

[Kevin Spencer]

Wouldn't it be better to use Cache?

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

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:u5******** ******@TK2MSFTN GP10.phx.gbl...

'To store a variable:
Application.Loc k()
Application("My Var")="whatever "
Application.Unl ock()

'to retrieve the variable:
Dim s as String = Application("My Var").ToString( )

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Hello,

Can you tell me how to store the global variables in the Application
Object?
What should the code be and where should I place it?

I am just starting with ASP.NET.

Thanks,
Miguel

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:St***@Orr. net:

With a web app, generally your global variables should be stored in the
Application Object or Cache object. This way they are explicity made
accessible to all code in your app.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl...
> Hello,
>
> I am working on an ASP.NET / VB page and I created a variable "query": >
> Sub Page_Load(sende r As Object, e As System.EventArg s)
> Dim query as String = String.Empty
> ...
> query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
> End
>
> Sub
>
> I need "query" to be global and accessible everywhere.
> How can I do this?
>
> Thanks,
> Miguel
>

[Juan T. Llibre [MVP]]

Steve,

Doesn't serializing the access to the Application object
using the Lock and UnLock methods mean you have to
accept a considerable performance hit ?

It seems to me that, although using the Application object
gets the job done, it does so in a very inefficient way.

That's why I suggested adding a key in web.config,
and retrieving *that* whenever needed.

Juan T. Llibre
===========
"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:u5******** ******@TK2MSFTN GP10.phx.gbl...

'To store a variable:
Application.Loc k()
Application("My Var")="whatever "
Application.Unl ock()

'to retrieve the variable:
Dim s as String = Application("My Var").ToString( )

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Hello,

Can you tell me how to store the global variables in the Application
Object?
What should the code be and where should I place it?

I am just starting with ASP.NET.

Thanks,
Miguel

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:St***@Orr. net:

With a web app, generally your global variables should be stored in the
Application Object or Cache object. This way they are explicity made
accessible to all code in your app.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message

news:OP******** ******@TK2MSFTN GP09.phx.gbl...
> Hello,
>
> I am working on an ASP.NET / VB page and I created a variable "query":
>
> Sub Page_Load(sende r As Object, e As System.EventArg s)
> Dim query as String = String.Empty
> ...
> query = String.Format(" SELECT * FROM dbo.documents WHERE ") & query
> End
>
> Sub
>
> I need "query" to be global and accessible everywhere.
> How can I do this?
>
> Thanks,
> Miguel
>

[John Saunders]

"Juan T. Llibre [MVP]" <no***********@ nowhere.com> wrote in message
news:uB******** ******@TK2MSFTN GP11.phx.gbl...

Steve,

Doesn't serializing the access to the Application object
using the Lock and UnLock methods mean you have to
accept a considerable performance hit ?

Steve, why do you need to serialize writes? Updates maybe, but why simple
writes?

John Saunders

[Scott Allen]

Searching the underlying data structure to see if and where the key
exists wouldn't be an atomic operation, something could change in
betwen the 'find the entry' and the 'insert' or 'write' operation.

Fortunately, the docs say the Application object is safe for
multi-threaded access. The Lock / Unlock would't be required for a
single write operation. Reflector shows it uses a slightly more
granular reader/writer lock underneath for thread safety:

this._lock.Acqu ireWrite();
try
{
base.BaseSet(na me, value);

}
finally
{
this._lock.Rele aseWrite();
}

--
Scott
http://www.OdeToCode.com/blogs/scott/

On Tue, 14 Dec 2004 13:13:43 -0500, "John Saunders" <johnwsaundersi ii
at hotmail.com> wrote:

"Juan T. Llibre [MVP]" <no***********@ nowhere.com> wrote in message
news:uB******* *******@TK2MSFT NGP11.phx.gbl.. .

Steve,

Doesn't serializing the access to the Application object
using the Lock and UnLock methods mean you have to
accept a considerable performance hit ?

Steve, why do you need to serialize writes? Updates maybe, but why simple
writes?

John Saunders