Delcare a Public Variable.

[Phillip Vong]

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a link
and I want to use this querystring over and over again through out the page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

[Scott M.]

Just put:

Dim myVar as string

in your page class but not inside any particular sub or function and then
put:

myVar = Request.queryst ring("MyVar")

in your Page_Load sub and it will be available to all other subs & functions
throughout the page.


"Phillip Vong" <phillip_vong*a t*yahoo*dot*com wrote in message
news:%2******** ********@TK2MSF TNGP05.phx.gbl. ..

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a
link and I want to use this querystring over and over again through out
the page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

[=?Utf-8?B?UGV0ZXIgQnJvbWJlcmcgW0MjIE1WUF0=?=]

Declare the string variable above the Page_Load method (not inside the body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"Phillip Vong" wrote:

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a link
and I want to use this querystring over and over again through out the page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

[=?Utf-8?B?TWlsb3N6IFNrYWxlY2tpIFtNQ0FEXQ==?=]

Or create a property with lazy intialization:

Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property

I may look horrible, but it's actually simple idea. Then wherever on the
page code you can use the property:

Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load

If Not IsPostBack Then
DisplaySomeInfo rmationBasedOnM yVarValue(MyVar )
End If

end sub

--
Milosz
"Peter Bromberg [C# MVP]" wrote:

Declare the string variable above the Page_Load method (not inside the body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"Phillip Vong" wrote:

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a link
and I want to use this querystring over and over again through out the page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

[Scott M.]

By making the variable the way we have suggested, it become a class field
and is accessible anywhere within the class by simply using its name or, if
you like, me.myVar, to get intelliSense. I prefer the 2 line solution.
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA******** *************** ***********@mic rosoft.com...

Or create a property with lazy intialization:

Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property

I may look horrible, but it's actually simple idea. Then wherever on the
page code you can use the property:

Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load

If Not IsPostBack Then
DisplaySomeInfo rmationBasedOnM yVarValue(MyVar )
End If

end sub

--
Milosz
"Peter Bromberg [C# MVP]" wrote:

>Declare the string variable above the Page_Load method (not inside the
body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"Phillip Vong" wrote:

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a
link
and I want to use this querystring over and over again through out the
page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

[=?ISO-8859-1?Q?G=F6ran_Andersson?=]

Actually, if the value is expensive to get, it makes sense only to get
it if needed.

The choise of method depends on the situation, i.e. how the value is
fetched.

Scott M. wrote:

By making the variable the way we have suggested, it become a class field
and is accessible anywhere within the class by simply using its name or, if
you like, me.myVar, to get intelliSense. I prefer the 2 line solution.
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA******** *************** ***********@mic rosoft.com...

>Or create a property with lazy intialization:

Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property

I may look horrible, but it's actually simple idea. Then wherever on the
page code you can use the property:

Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load

If Not IsPostBack Then
DisplaySomeInf ormationBasedOn MyVarValue(MyVa r)
End If

end sub

--
Milosz
"Peter Bromberg [C# MVP]" wrote:

>>Declare the string variable above the Page_Load method (not inside the
body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"Phillip Vong" wrote:

Newbie learning in VB.NET 2.

I'm creating a simple ASP.NET 2 page and I pulling a querystring from a
link
and I want to use this querystring over and over again through out the
page.

Example.

Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable

Then I can just call this variable from anywhere to grab MyVar.

Thanks!
Phil

--
Göran Andersson
_____
http://www.guffa.com

[Scott M.]

Yes, but that is not the case here, the value is simply a queryString value.
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uV******** ******@TK2MSFTN GP02.phx.gbl...

Actually, if the value is expensive to get, it makes sense only to get it
if needed.

The choise of method depends on the situation, i.e. how the value is
fetched.

Scott M. wrote:

>By making the variable the way we have suggested, it become a class field
and is accessible anywhere within the class by simply using its name or,
if you like, me.myVar, to get intelliSense. I prefer the 2 line
solution.
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA******* *************** ************@mi crosoft.com...

>>Or create a property with lazy intialization:

Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property

I may look horrible, but it's actually simple idea. Then wherever on the
page code you can use the property:

Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load

If Not IsPostBack Then
DisplaySomeIn formationBasedO nMyVarValue(MyV ar)
End If

end sub

--
Milosz
"Peter Bromberg [C# MVP]" wrote:

Declare the string variable above the Page_Load method (not inside the
body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"Phillip Vong" wrote:

Newbie learning in VB.NET 2.
>
I'm creating a simple ASP.NET 2 page and I pulling a querystring from
a link
and I want to use this querystring over and over again through out the
page.
>
Example.
>
Public Variable
Dim myVar as string = Request.queryst ring("MyVar")
End Public Variable
>
Then I can just call this variable from anywhere to grab MyVar.
>
Thanks!
Phil
>
>
>

--
Göran Andersson
_____
http://www.guffa.com

[=?ISO-8859-1?Q?G=F6ran_Andersson?=]

If you only ever write answers to the exact question, often you will not
be able to give the answer that the poster needs. Many times people
don't know what to ask for, or are only asking for the method that they
believe is the solution. Sometimes they even forget to ask a question,
so then you would not be able to reply at all...

I think that a read only property is one option that should be presented
in a discussion about "public" variables.

Scott M. wrote:

Yes, but that is not the case here, the value is simply a queryString value.
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uV******** ******@TK2MSFTN GP02.phx.gbl...

>Actually, if the value is expensive to get, it makes sense only to get it
if needed.

The choise of method depends on the situation, i.e. how the value is
fetched.

Scott M. wrote:

>>By making the variable the way we have suggested, it become a class field
and is accessible anywhere within the class by simply using its name or,
if you like, me.myVar, to get intelliSense. I prefer the 2 line
solution.
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA****** *************** *************@m icrosoft.com...
Or create a property with lazy intialization:

Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property

I may look horrible, but it's actually simple idea. Then wherever on the
page code you can use the property:

Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load

If Not IsPostBack Then
DisplaySomeI nformationBased OnMyVarValue(My Var)
End If

end sub

--
Milosz
"Peter Bromberg [C# MVP]" wrote:

Declare the string variable above the Page_Load method (not inside the
body
of the method. This puts it's scope to class level.
Then, assign the value either there or inside the Page_Load method.
Peter
--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net
>
>
>
>
"Phillip Vong" wrote:
>
>Newbie learning in VB.NET 2.
>>
>I'm creating a simple ASP.NET 2 page and I pulling a querystring from
>a link
>and I want to use this querystring over and over again through out the
>page.
>>
>Example.
>>
>Public Variable
>Dim myVar as string = Request.queryst ring("MyVar")
>End Public Variable
>>
>Then I can just call this variable from anywhere to grab MyVar.
>>
>Thanks!
>Phil
>>
>>
>>

--
Göran Andersson
_____
http://www.guffa.com

--
Göran Andersson
_____
http://www.guffa.com

[Scott M.]

Fine, but if you only provide solutions without explanations as to why and
where they should be used (as you did in your first reply) you aren't
serving the OP either.

A specific question was asked and a specific answer was given. You could
have simply started your post with: In situations where retrieving the
property value is expensive, a property might be a better alternative...
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uQ******** *****@TK2MSFTNG P03.phx.gbl...

If you only ever write answers to the exact question, often you will not
be able to give the answer that the poster needs. Many times people don't
know what to ask for, or are only asking for the method that they believe
is the solution. Sometimes they even forget to ask a question, so then you
would not be able to reply at all...

I think that a read only property is one option that should be presented
in a discussion about "public" variables.

Scott M. wrote:

>Yes, but that is not the case here, the value is simply a queryString
value.
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uV******* *******@TK2MSFT NGP02.phx.gbl.. .

>>Actually, if the value is expensive to get, it makes sense only to get
it if needed.

The choise of method depends on the situation, i.e. how the value is
fetched.

Scott M. wrote:
By making the variable the way we have suggested, it become a class
field and is accessible anywhere within the class by simply using its
name or, if you like, me.myVar, to get intelliSense. I prefer the 2
line solution.
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA***** *************** **************@ microsoft.com.. .
Or create a property with lazy intialization:
>
Private _myVar As String
Protected ReadOnly Property MyVar() As String
Get
If _myVar Is Nothing Then
_myVar = Request.QuerySt ring("MyVar")
If _myVar Is Nothing Then
_myVar = String.Empty
End If
End If
Return _myVar
End Get
End Property
>
I may look horrible, but it's actually simple idea. Then wherever on
the
page code you can use the property:
>
Protected Sub Page_Load(ByVal sender As Object,
ByVal e As System.EventArg s) Handles Me.Load
>
If Not IsPostBack Then
DisplaySome InformationBase dOnMyVarValue(M yVar)
End If
>
end sub
>
--
Milosz
>
>
"Peter Bromberg [C# MVP]" wrote:
>
>Declare the string variable above the Page_Load method (not inside
>the body
>of the method. This puts it's scope to class level.
>Then, assign the value either there or inside the Page_Load method.
>Peter
>--
>Site: http://www.eggheadcafe.com
>UnBlog: http://petesbloggerama.blogspot.com
>Short urls & more: http://ittyurl.net
>>
>>
>>
>>
>"Phillip Vong" wrote:
>>
>>Newbie learning in VB.NET 2.
>>>
>>I'm creating a simple ASP.NET 2 page and I pulling a querystring
>>from a link
>>and I want to use this querystring over and over again through out
>>the page.
>>>
>>Example .
>>>
>>Public Variable
>>Dim myVar as string = Request.queryst ring("MyVar")
>>End Public Variable
>>>
>>Then I can just call this variable from anywhere to grab MyVar.
>>>
>>Thanks!
>>Phil
>>>
>>>
>>>
--
Göran Andersson
_____
http://www.guffa.com

--
Göran Andersson
_____
http://www.guffa.com

[=?ISO-8859-1?Q?G=F6ran_Andersson?=]

Scott M. wrote:

Fine, but if you only provide solutions without explanations as to why and
where they should be used (as you did in your first reply) you aren't
serving the OP either.

Perhaps you should read my first reply again? Where do you see me
providing a solution without any explanation?

A specific question was asked and a specific answer was given. You could
have simply started your post with: In situations where retrieving the
property value is expensive, a property might be a better alternative...

I started my post with: "Actually, if the value is expensive to get, it
makes sense only to get it if needed."'

I don't see why you think that this differs in any way that matters from
what you suggested.

>
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uQ******** *****@TK2MSFTNG P03.phx.gbl...

>If you only ever write answers to the exact question, often you will not
be able to give the answer that the poster needs. Many times people don't
know what to ask for, or are only asking for the method that they believe
is the solution. Sometimes they even forget to ask a question, so then you
would not be able to reply at all...

I think that a read only property is one option that should be presented
in a discussion about "public" variables.

Scott M. wrote:

>>Yes, but that is not the case here, the value is simply a queryString
value.
"Göran Andersson" <gu***@guffa.co mwrote in message
news:uV****** ********@TK2MSF TNGP02.phx.gbl. ..
Actually, if the value is expensive to get, it makes sense only to get
it if needed.

The choise of method depends on the situation, i.e. how the value is
fetched.

Scott M. wrote:
By making the variable the way we have suggested, it become a class
field and is accessible anywhere within the class by simply using its
name or, if you like, me.myVar, to get intelliSense. I prefer the 2
line solution.
>
>
"Milosz Skalecki [MCAD]" <mi*****@DONTLI KESPAMwp.plwrot e in message
news:FA**** *************** *************** @microsoft.com. ..
>Or create a property with lazy intialization:
>>
>Private _myVar As String
>Protecte d ReadOnly Property MyVar() As String
>Get
>If _myVar Is Nothing Then
>_myVar = Request.QuerySt ring("MyVar")
>If _myVar Is Nothing Then
>_myVar = String.Empty
>End If
>End If
>Return _myVar
>End Get
>End Property
>>
>I may look horrible, but it's actually simple idea. Then wherever on
>the
>page code you can use the property:
>>
>Protecte d Sub Page_Load(ByVal sender As Object,
>ByVal e As System.EventArg s) Handles Me.Load
>>
>If Not IsPostBack Then
>DisplaySom eInformationBas edOnMyVarValue( MyVar)
>End If
>>
>end sub
>>
>--
>Milosz
>>
>>
>"Peter Bromberg [C# MVP]" wrote:
>>
>>Declare the string variable above the Page_Load method (not inside
>>the body
>>of the method. This puts it's scope to class level.
>>Then, assign the value either there or inside the Page_Load method.
>>Peter
>>--
>>Site: http://www.eggheadcafe.com
>>UnBlog: http://petesbloggerama.blogspot.com
>>Short urls & more: http://ittyurl.net
>>>
>>>
>>>
>>>
>>"Philli p Vong" wrote:
>>>
>>>Newbie learning in VB.NET 2.
>>>>
>>>I'm creating a simple ASP.NET 2 page and I pulling a querystring
>>>from a link
>>>and I want to use this querystring over and over again through out
>>>the page.
>>>>
>>>Exampl e.
>>>>
>>>Public Variable
>>>Dim myVar as string = Request.queryst ring("MyVar")
>>>End Public Variable
>>>>
>>>Then I can just call this variable from anywhere to grab MyVar.
>>>>
>>>Thanks !
>>>Phil
>>>>
>>>>
>>>>
--
Göran Andersson
_____
http://www.guffa.com

--
Göran Andersson
_____
http://www.guffa.com

--
Göran Andersson
_____
http://www.guffa.com