using IIS: What is the difference between Page_Init and Page

What is the difference between the Page_Init and Page_Load events? When I
was debugging my code, they both seemed to get triggered on every postback.
I am assuming that there is some difference, and I would like to know what
it is so that I can take advantage of it in my code. Thanks.
--
Nathan Sokalski
njsokalski@dotnet.itags.org.hotmail.com
http://www.nathansokalski.com/Page_Init

The Page_Init event is the first to occur
when an ASP.NET page is executed.

This is where you perform any initialization steps that
you need to set up or create instances of server controls.

You can't access controls in this event because
there is no guarantee that they have been created yet.

Controls are created during this event, and you can control
whether your attempt to use these objects will be denied by
the server processing your request.

The Page_Init event fires only the first time the page is loaded.
When you postback to any page, the Page_Init event doesn't fire.

The Page_Load event fires each time the page loads, postback or not.

Page_Load

This event occurs only when all the objects on the
page have been created and are available for use.

ASP.NET 1.x Page Lifecycle:
http://msdn.microsoft.com/library/d...ssingStages.asp

ASP.NET 2.0 Page LifeCycle:
http://msdn.microsoft.com/asp.net/d...l/Internals.asp

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net

"Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
> What is the difference between the Page_Init and Page_Load events? When I
> was debugging my code, they both seemed to get triggered on every
> postback. I am assuming that there is some difference, and I would like to
> know what it is so that I can take advantage of it in my code. Thanks.
> --
> Nathan Sokalski
> njsokalski@.hotmail.com
> http://www.nathansokalski.com/
That's what I thought, but in all the debugging I have done the Init event
gets fired regardless. The specific test I did was creating two labels, one
of which I modify in the Init, and one that I modify in the Load. I clear
them between postbacks using a Button.Click event handler and set
EnableViewState="false" for the Labels. I also used Visual Studio's Debug
feature, and it showed the code inside Init being executed on each postback.
Maybe I'm doing something wrong in my test, could you either tell me what
I'm forgetting or send me an example? What you said is what I thought the
difference was, but for some reason it isn't working that way for me.
Thanks.
--
Nathan Sokalski
njsokalski@.hotmail.com
http://www.nathansokalski.com/

"Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
> Page_Init
> The Page_Init event is the first to occur
> when an ASP.NET page is executed.
> This is where you perform any initialization steps that
> you need to set up or create instances of server controls.
> You can't access controls in this event because
> there is no guarantee that they have been created yet.
> Controls are created during this event, and you can control
> whether your attempt to use these objects will be denied by
> the server processing your request.
> The Page_Init event fires only the first time the page is loaded.
> When you postback to any page, the Page_Init event doesn't fire.
> The Page_Load event fires each time the page loads, postback or not.
> Page_Load
> This event occurs only when all the objects on the
> page have been created and are available for use.
>
>
> Juan T. Llibre, ASP.NET MVP
> ASP.NET FAQ : http://asp.net.do/faq/
> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
> ======================================
> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
> news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
>> What is the difference between the Page_Init and Page_Load events? When I
>> was debugging my code, they both seemed to get triggered on every
>> postback. I am assuming that there is some difference, and I would like
>> to know what it is so that I can take advantage of it in my code. Thanks.
>> --
>> Nathan Sokalski
>> njsokalski@.hotmail.com
>> http://www.nathansokalski.com/
>>
Nathan Sokalski wrote:
> That's what I thought, but in all the debugging I have done the Init
> event gets fired regardless. The specific test I did was creating two
> labels, one of which I modify in the Init, and one that I modify in
> the Load. I clear them between postbacks using a Button.Click event
> handler and set EnableViewState="false" for the Labels. I also used
> Visual Studio's Debug feature, and it showed the code inside Init
> being executed on each postback. Maybe I'm doing something wrong in
> my test, could you either tell me what I'm forgetting or send me an
> example? What you said is what I thought the difference was, but for
> some reason it isn't working that way for me. Thanks.
> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
> The Page_Init event fires only the first time the page is loaded.
> When you postback to any page, the Page_Init event doesn't fire.
> The Page_Load event fires each time the page loads, postback or not.

Page_Init always fires, postback or no.

--
Jim Cheshire
JIMCO Software
http://www.jimcosoftware.com

FrontPage add-ins for FrontPage 2000 - 2003
"Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...

> The Page_Init event fires only the first time the page is loaded.
> When you postback to any page, the Page_Init event doesn't fire.

Er... are you sure about this...?
re:
> Maybe I'm doing something wrong in my test, could you either tell me what I'm forgetting
> or send me an example?

I can't possibly know what you're forgetting
because I don't know what you're doing.

How about posting your code so we can, maybe, help you ?

Reduce the sample to the bare minimum needed, please.

Juan T. Llibre, ASP.NET MVP
ASP.NET FAQ : http://asp.net.do/faq/
Foros de ASP.NET en Espaol : http://asp.net.do/foros/
======================================
"Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
news:%237q02gYwFHA.1132@.TK2MSFTNGP10.phx.gbl...
> That's what I thought, but in all the debugging I have done the Init event gets fired
> regardless. The specific test I did was creating two labels, one of which I modify in
> the Init, and one that I modify in the Load. I clear them between postbacks using a
> Button.Click event handler and set EnableViewState="false" for the Labels. I also used
> Visual Studio's Debug feature, and it showed the code inside Init being executed on each
> postback. Maybe I'm doing something wrong in my test, could you either tell me what I'm
> forgetting or send me an example? What you said is what I thought the difference was,
> but for some reason it isn't working that way for me. Thanks.
> --
> Nathan Sokalski
> njsokalski@.hotmail.com
> http://www.nathansokalski.com/
> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
>> Page_Init
>>
>> The Page_Init event is the first to occur
>> when an ASP.NET page is executed.
>>
>> This is where you perform any initialization steps that
>> you need to set up or create instances of server controls.
>>
>> You can't access controls in this event because
>> there is no guarantee that they have been created yet.
>>
>> Controls are created during this event, and you can control
>> whether your attempt to use these objects will be denied by
>> the server processing your request.
>>
>> The Page_Init event fires only the first time the page is loaded.
>> When you postback to any page, the Page_Init event doesn't fire.
>>
>> The Page_Load event fires each time the page loads, postback or not.
>>
>> Page_Load
>>
>> This event occurs only when all the objects on the
>> page have been created and are available for use.
>>
>>
>>
>>
>> Juan T. Llibre, ASP.NET MVP
>> ASP.NET FAQ : http://asp.net.do/faq/
>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>> ======================================
>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>> news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
>>> What is the difference between the Page_Init and Page_Load events? When I was
>>> debugging my code, they both seemed to get triggered on every postback. I am assuming
>>> that there is some difference, and I would like to know what it is so that I can take
>>> advantage of it in my code. Thanks.
>>> --
>>> Nathan Sokalski
>>> njsokalski@.hotmail.com
>>> http://www.nathansokalski.com/
>>>
>>
>>
re:
> Page_Init always fires, postback or no.

You're right, of course.
My apologies to all for that short-circuit.

The page lifecycle table at :
http://msdn.microsoft.com/asp.net/d...l/Internals.asp
lists the ASP.NET 2.0 events that happen all the time,
and the events which only occur on postback.

Juan T. Llibre, ASP.NET MVP
ASP.NET FAQ : http://asp.net.do/faq/
Foros de ASP.NET en Espaol : http://asp.net.do/foros/
======================================
"JIMCO Software" <contactus@.jimcosoftware.com> wrote in message
news:%23EdENuYwFHA.596@.TK2MSFTNGP12.phx.gbl...
> Nathan Sokalski wrote:
>> That's what I thought, but in all the debugging I have done the Init
>> event gets fired regardless. The specific test I did was creating two
>> labels, one of which I modify in the Init, and one that I modify in
>> the Load. I clear them between postbacks using a Button.Click event
>> handler and set EnableViewState="false" for the Labels. I also used
>> Visual Studio's Debug feature, and it showed the code inside Init
>> being executed on each postback. Maybe I'm doing something wrong in
>> my test, could you either tell me what I'm forgetting or send me an
>> example? What you said is what I thought the difference was, but for
>> some reason it isn't working that way for me. Thanks.
>>
>> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
>> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
>>
>> The Page_Init event fires only the first time the page is loaded.
>> When you postback to any page, the Page_Init event doesn't fire.
>>
>> The Page_Load event fires each time the page loads, postback or not.
>
> Page_Init always fires, postback or no.
> --
> Jim Cheshire
> JIMCO Software
> http://www.jimcosoftware.com
> FrontPage add-ins for FrontPage 2000 - 2003
>
Juan T. Llibre wrote:
> re:
>> Page_Init always fires, postback or no.
> You're right, of course.
> My apologies to all for that short-circuit.

Lord knows, happens to all of us. :)

--
Jim Cheshire
JIMCO Software
http://www.jimcosoftware.com

FrontPage add-ins for FrontPage 2000 - 2003
This is too tough a league to bat 1.000 in... ;-)

Juan
======
"JIMCO Software" <contactus@.jimcosoftware.com> wrote in message
news:Oq2$BOdwFHA.340@.TK2MSFTNGP10.phx.gbl...
> Juan T. Llibre wrote:
>> re:
>>> Page_Init always fires, postback or no.
>>
>> You're right, of course.
>> My apologies to all for that short-circuit.

> Lord knows, happens to all of us. :)
> Jim Cheshire
> JIMCO Software
> http://www.jimcosoftware.com
> FrontPage add-ins for FrontPage 2000 - 2003
Here is my code:

<%@. Page Language="vb" AutoEventWireup="false" Codebehind="InitLoad.aspx.vb"
Inherits="WebApplication1.InitLoad"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>InitLoad</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema"
content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:Label id="lblInitStatus" runat="server"
EnableViewState="False">Fired Init Event: </asp:Label><BR>
<asp:Label id="lblLoadStatus" runat="server"
EnableViewState="False">Fired Load Event: </asp:Label><BR>
<BR>
<asp:Button id="btnResetStatus" runat="server" Text="Reset Init &
Load Status" Font-Bold="True"
Width="168px" EnableViewState="False"></asp:Button><BR>
<BR>
<asp:Button id="btnDoAPostback" runat="server" Text="Do A Postback"
Font-Bold="True" Width="104px"
EnableViewState="False"></asp:Button>
</form>
</body>
</HTML
Public Class InitLoad

Inherits System.Web.UI.Page

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub

Protected WithEvents lblInitStatus As System.Web.UI.WebControls.Label

Protected WithEvents lblLoadStatus As System.Web.UI.WebControls.Label

Protected WithEvents btnResetStatus As System.Web.UI.WebControls.Button

Protected WithEvents btnDoAPostback As System.Web.UI.WebControls.Button

'NOTE: The following placeholder declaration is required by the Web Form
Designer.

'Do not delete or move it.

Private designerPlaceholderDeclaration As System.Object

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Init

'CODEGEN: This method call is required by the Web Form Designer

'Do not modify it using the code editor.

InitializeComponent()

lblInitStatus.Text &= "FIRED"

End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

lblLoadStatus.Text &= "FIRED"

End Sub

Private Sub btnResetStatus_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnResetStatus.Click

lblInitStatus.Text = "Fired Init Event: "

lblLoadStatus.Text = "Fired Load Event: "

End Sub

Private Sub btnDoAPostback_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnDoAPostback.Click

If btnDoAPostback.BackColor.Equals(Color.Silver) Then

btnDoAPostback.BackColor = Color.Black

btnDoAPostback.BorderColor = Color.Black

btnDoAPostback.ForeColor = Color.Silver

Else

btnDoAPostback.BackColor = Color.Silver

btnDoAPostback.BorderColor = Color.Silver

btnDoAPostback.ForeColor = Color.Black

End If

End Sub

End Class

This code has two Labels and two Buttons. The two Labels let you know
whether the Init and Load events were fired. The first button resets the
Labels, and the second Button is used to perform a postback (I simply have
the button invert its BackColor and ForeColors). However, the Init event is
fired every time.
--
Nathan Sokalski
njsokalski@.hotmail.com
http://www.nathansokalski.com/
"Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
news:OD99mWbwFHA.4032@.TK2MSFTNGP15.phx.gbl...
> re:
>> Maybe I'm doing something wrong in my test, could you either tell me what
>> I'm forgetting or send me an example?
> I can't possibly know what you're forgetting
> because I don't know what you're doing.
> How about posting your code so we can, maybe, help you ?
> Reduce the sample to the bare minimum needed, please.
>
> Juan T. Llibre, ASP.NET MVP
> ASP.NET FAQ : http://asp.net.do/faq/
> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
> ======================================
> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
> news:%237q02gYwFHA.1132@.TK2MSFTNGP10.phx.gbl...
>> That's what I thought, but in all the debugging I have done the Init
>> event gets fired regardless. The specific test I did was creating two
>> labels, one of which I modify in the Init, and one that I modify in the
>> Load. I clear them between postbacks using a Button.Click event handler
>> and set EnableViewState="false" for the Labels. I also used Visual
>> Studio's Debug feature, and it showed the code inside Init being executed
>> on each postback. Maybe I'm doing something wrong in my test, could you
>> either tell me what I'm forgetting or send me an example? What you said
>> is what I thought the difference was, but for some reason it isn't
>> working that way for me. Thanks.
>> --
>> Nathan Sokalski
>> njsokalski@.hotmail.com
>> http://www.nathansokalski.com/
>>
>> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
>> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
>>> Page_Init
>>>
>>> The Page_Init event is the first to occur
>>> when an ASP.NET page is executed.
>>>
>>> This is where you perform any initialization steps that
>>> you need to set up or create instances of server controls.
>>>
>>> You can't access controls in this event because
>>> there is no guarantee that they have been created yet.
>>>
>>> Controls are created during this event, and you can control
>>> whether your attempt to use these objects will be denied by
>>> the server processing your request.
>>>
>>> The Page_Init event fires only the first time the page is loaded.
>>> When you postback to any page, the Page_Init event doesn't fire.
>>>
>>> The Page_Load event fires each time the page loads, postback or not.
>>>
>>> Page_Load
>>>
>>> This event occurs only when all the objects on the
>>> page have been created and are available for use.
>>>
>>>
>>>
>>>
>>> Juan T. Llibre, ASP.NET MVP
>>> ASP.NET FAQ : http://asp.net.do/faq/
>>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>>> ======================================
>>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>>> news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
>>>> What is the difference between the Page_Init and Page_Load events? When
>>>> I was debugging my code, they both seemed to get triggered on every
>>>> postback. I am assuming that there is some difference, and I would like
>>>> to know what it is so that I can take advantage of it in my code.
>>>> Thanks.
>>>> --
>>>> Nathan Sokalski
>>>> njsokalski@.hotmail.com
>>>> http://www.nathansokalski.com/
>>>>
>>>
>>>
>>
>>
Check out the followin article in the .Net SDK:

http://msdn.microsoft.com/library/d...onLifecycle.asp

I keep a printed copy on my office wall.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
I'd rather be a hammer than a nail.

"Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
news:%23oVOKafwFHA.2656@.TK2MSFTNGP09.phx.gbl...
> Here is my code:
>
> <%@. Page Language="vb" AutoEventWireup="false"
> Codebehind="InitLoad.aspx.vb" Inherits="WebApplication1.InitLoad"%>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> <HTML>
> <HEAD>
> <title>InitLoad</title>
> <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
> <meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
> <meta name="vs_defaultClientScript" content="JavaScript">
> <meta name="vs_targetSchema"
> content="http://schemas.microsoft.com/intellisense/ie5">
> </HEAD>
> <body>
> <form id="Form1" method="post" runat="server">
> <asp:Label id="lblInitStatus" runat="server"
> EnableViewState="False">Fired Init Event: </asp:Label><BR>
> <asp:Label id="lblLoadStatus" runat="server"
> EnableViewState="False">Fired Load Event: </asp:Label><BR>
> <BR>
> <asp:Button id="btnResetStatus" runat="server" Text="Reset Init &
> Load Status" Font-Bold="True"
> Width="168px" EnableViewState="False"></asp:Button><BR>
> <BR>
> <asp:Button id="btnDoAPostback" runat="server" Text="Do A Postback"
> Font-Bold="True" Width="104px"
> EnableViewState="False"></asp:Button>
> </form>
> </body>
> </HTML>
>
> Public Class InitLoad
> Inherits System.Web.UI.Page
> #Region " Web Form Designer Generated Code "
> 'This call is required by the Web Form Designer.
> <System.Diagnostics.DebuggerStepThrough()> Private Sub
> InitializeComponent()
> End Sub
> Protected WithEvents lblInitStatus As System.Web.UI.WebControls.Label
> Protected WithEvents lblLoadStatus As System.Web.UI.WebControls.Label
> Protected WithEvents btnResetStatus As System.Web.UI.WebControls.Button
> Protected WithEvents btnDoAPostback As System.Web.UI.WebControls.Button
> 'NOTE: The following placeholder declaration is required by the Web Form
> Designer.
> 'Do not delete or move it.
> Private designerPlaceholderDeclaration As System.Object
> Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Init
> 'CODEGEN: This method call is required by the Web Form Designer
> 'Do not modify it using the code editor.
> InitializeComponent()
> lblInitStatus.Text &= "FIRED"
> End Sub
> #End Region
> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
> lblLoadStatus.Text &= "FIRED"
> End Sub
> Private Sub btnResetStatus_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles btnResetStatus.Click
> lblInitStatus.Text = "Fired Init Event: "
> lblLoadStatus.Text = "Fired Load Event: "
> End Sub
> Private Sub btnDoAPostback_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles btnDoAPostback.Click
> If btnDoAPostback.BackColor.Equals(Color.Silver) Then
> btnDoAPostback.BackColor = Color.Black
> btnDoAPostback.BorderColor = Color.Black
> btnDoAPostback.ForeColor = Color.Silver
> Else
> btnDoAPostback.BackColor = Color.Silver
> btnDoAPostback.BorderColor = Color.Silver
> btnDoAPostback.ForeColor = Color.Black
> End If
> End Sub
> End Class
>
> This code has two Labels and two Buttons. The two Labels let you know
> whether the Init and Load events were fired. The first button resets the
> Labels, and the second Button is used to perform a postback (I simply have
> the button invert its BackColor and ForeColors). However, the Init event
> is fired every time.
> --
> Nathan Sokalski
> njsokalski@.hotmail.com
> http://www.nathansokalski.com/
> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
> news:OD99mWbwFHA.4032@.TK2MSFTNGP15.phx.gbl...
>> re:
>>> Maybe I'm doing something wrong in my test, could you either tell me
>>> what I'm forgetting or send me an example?
>>
>> I can't possibly know what you're forgetting
>> because I don't know what you're doing.
>>
>> How about posting your code so we can, maybe, help you ?
>>
>> Reduce the sample to the bare minimum needed, please.
>>
>>
>>
>> Juan T. Llibre, ASP.NET MVP
>> ASP.NET FAQ : http://asp.net.do/faq/
>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>> ======================================
>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>> news:%237q02gYwFHA.1132@.TK2MSFTNGP10.phx.gbl...
>>> That's what I thought, but in all the debugging I have done the Init
>>> event gets fired regardless. The specific test I did was creating two
>>> labels, one of which I modify in the Init, and one that I modify in the
>>> Load. I clear them between postbacks using a Button.Click event handler
>>> and set EnableViewState="false" for the Labels. I also used Visual
>>> Studio's Debug feature, and it showed the code inside Init being
>>> executed on each postback. Maybe I'm doing something wrong in my test,
>>> could you either tell me what I'm forgetting or send me an example? What
>>> you said is what I thought the difference was, but for some reason it
>>> isn't working that way for me. Thanks.
>>> --
>>> Nathan Sokalski
>>> njsokalski@.hotmail.com
>>> http://www.nathansokalski.com/
>>>
>>> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
>>> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
>>>> Page_Init
>>>>
>>>> The Page_Init event is the first to occur
>>>> when an ASP.NET page is executed.
>>>>
>>>> This is where you perform any initialization steps that
>>>> you need to set up or create instances of server controls.
>>>>
>>>> You can't access controls in this event because
>>>> there is no guarantee that they have been created yet.
>>>>
>>>> Controls are created during this event, and you can control
>>>> whether your attempt to use these objects will be denied by
>>>> the server processing your request.
>>>>
>>>> The Page_Init event fires only the first time the page is loaded.
>>>> When you postback to any page, the Page_Init event doesn't fire.
>>>>
>>>> The Page_Load event fires each time the page loads, postback or not.
>>>>
>>>> Page_Load
>>>>
>>>> This event occurs only when all the objects on the
>>>> page have been created and are available for use.
>>>>
>>>>
>>>>
>>>>
>>>> Juan T. Llibre, ASP.NET MVP
>>>> ASP.NET FAQ : http://asp.net.do/faq/
>>>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>>>> ======================================
>>>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>>>> news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
>>>>> What is the difference between the Page_Init and Page_Load events?
>>>>> When I was debugging my code, they both seemed to get triggered on
>>>>> every postback. I am assuming that there is some difference, and I
>>>>> would like to know what it is so that I can take advantage of it in my
>>>>> code. Thanks.
>>>>> --
>>>>> Nathan Sokalski
>>>>> njsokalski@.hotmail.com
>>>>> http://www.nathansokalski.com/
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
you geek Spencer........lol

Mines in the drawer at least!!!!

--
Regards

John Timney
ASP.NET MVP
Microsoft Regional Director

"Kevin Spencer" <kevin@.DIESPAMMERSDIEtakempis.com> wrote in message
news:uDjiQkowFHA.736@.tk2msftngp13.phx.gbl...
> Check out the followin article in the .Net SDK:
> http://msdn.microsoft.com/library/d...onLifecycle.asp
> I keep a printed copy on my office wall.
> --
> HTH,
> Kevin Spencer
> Microsoft MVP
> .Net Developer
> I'd rather be a hammer than a nail.
> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
> news:%23oVOKafwFHA.2656@.TK2MSFTNGP09.phx.gbl...
>> Here is my code:
>>
>>
>> <%@. Page Language="vb" AutoEventWireup="false"
>> Codebehind="InitLoad.aspx.vb" Inherits="WebApplication1.InitLoad"%>
>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
>> <HTML>
>> <HEAD>
>> <title>InitLoad</title>
>> <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
>> <meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
>> <meta name="vs_defaultClientScript" content="JavaScript">
>> <meta name="vs_targetSchema"
>> content="http://schemas.microsoft.com/intellisense/ie5">
>> </HEAD>
>> <body>
>> <form id="Form1" method="post" runat="server">
>> <asp:Label id="lblInitStatus" runat="server"
>> EnableViewState="False">Fired Init Event: </asp:Label><BR>
>> <asp:Label id="lblLoadStatus" runat="server"
>> EnableViewState="False">Fired Load Event: </asp:Label><BR>
>> <BR>
>> <asp:Button id="btnResetStatus" runat="server" Text="Reset Init &
>> Load Status" Font-Bold="True"
>> Width="168px" EnableViewState="False"></asp:Button><BR>
>> <BR>
>> <asp:Button id="btnDoAPostback" runat="server" Text="Do A Postback"
>> Font-Bold="True" Width="104px"
>> EnableViewState="False"></asp:Button>
>> </form>
>> </body>
>> </HTML>
>>
>>
>> Public Class InitLoad
>>
>> Inherits System.Web.UI.Page
>>
>> #Region " Web Form Designer Generated Code "
>>
>> 'This call is required by the Web Form Designer.
>>
>> <System.Diagnostics.DebuggerStepThrough()> Private Sub
>> InitializeComponent()
>>
>> End Sub
>>
>> Protected WithEvents lblInitStatus As System.Web.UI.WebControls.Label
>>
>> Protected WithEvents lblLoadStatus As System.Web.UI.WebControls.Label
>>
>> Protected WithEvents btnResetStatus As System.Web.UI.WebControls.Button
>>
>> Protected WithEvents btnDoAPostback As System.Web.UI.WebControls.Button
>>
>> 'NOTE: The following placeholder declaration is required by the Web Form
>> Designer.
>>
>> 'Do not delete or move it.
>>
>> Private designerPlaceholderDeclaration As System.Object
>>
>> Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
>> System.EventArgs) Handles MyBase.Init
>>
>> 'CODEGEN: This method call is required by the Web Form Designer
>>
>> 'Do not modify it using the code editor.
>>
>> InitializeComponent()
>>
>> lblInitStatus.Text &= "FIRED"
>>
>> End Sub
>>
>> #End Region
>>
>> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
>> System.EventArgs) Handles MyBase.Load
>>
>> lblLoadStatus.Text &= "FIRED"
>>
>> End Sub
>>
>> Private Sub btnResetStatus_Click(ByVal sender As System.Object, ByVal e
>> As System.EventArgs) Handles btnResetStatus.Click
>>
>> lblInitStatus.Text = "Fired Init Event: "
>>
>> lblLoadStatus.Text = "Fired Load Event: "
>>
>> End Sub
>>
>> Private Sub btnDoAPostback_Click(ByVal sender As System.Object, ByVal e
>> As System.EventArgs) Handles btnDoAPostback.Click
>>
>> If btnDoAPostback.BackColor.Equals(Color.Silver) Then
>>
>> btnDoAPostback.BackColor = Color.Black
>>
>> btnDoAPostback.BorderColor = Color.Black
>>
>> btnDoAPostback.ForeColor = Color.Silver
>>
>> Else
>>
>> btnDoAPostback.BackColor = Color.Silver
>>
>> btnDoAPostback.BorderColor = Color.Silver
>>
>> btnDoAPostback.ForeColor = Color.Black
>>
>> End If
>>
>> End Sub
>>
>> End Class
>>
>>
>>
>> This code has two Labels and two Buttons. The two Labels let you know
>> whether the Init and Load events were fired. The first button resets the
>> Labels, and the second Button is used to perform a postback (I simply
>> have the button invert its BackColor and ForeColors). However, the Init
>> event is fired every time.
>> --
>> Nathan Sokalski
>> njsokalski@.hotmail.com
>> http://www.nathansokalski.com/
>> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
>> news:OD99mWbwFHA.4032@.TK2MSFTNGP15.phx.gbl...
>>> re:
>>>> Maybe I'm doing something wrong in my test, could you either tell me
>>>> what I'm forgetting or send me an example?
>>>
>>> I can't possibly know what you're forgetting
>>> because I don't know what you're doing.
>>>
>>> How about posting your code so we can, maybe, help you ?
>>>
>>> Reduce the sample to the bare minimum needed, please.
>>>
>>>
>>>
>>> Juan T. Llibre, ASP.NET MVP
>>> ASP.NET FAQ : http://asp.net.do/faq/
>>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>>> ======================================
>>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>>> news:%237q02gYwFHA.1132@.TK2MSFTNGP10.phx.gbl...
>>>> That's what I thought, but in all the debugging I have done the Init
>>>> event gets fired regardless. The specific test I did was creating two
>>>> labels, one of which I modify in the Init, and one that I modify in the
>>>> Load. I clear them between postbacks using a Button.Click event handler
>>>> and set EnableViewState="false" for the Labels. I also used Visual
>>>> Studio's Debug feature, and it showed the code inside Init being
>>>> executed on each postback. Maybe I'm doing something wrong in my test,
>>>> could you either tell me what I'm forgetting or send me an example?
>>>> What you said is what I thought the difference was, but for some reason
>>>> it isn't working that way for me. Thanks.
>>>> --
>>>> Nathan Sokalski
>>>> njsokalski@.hotmail.com
>>>> http://www.nathansokalski.com/
>>>>
>>>> "Juan T. Llibre" <nomailreplies@.nowhere.com> wrote in message
>>>> news:%23OY11sVwFHA.904@.tk2msftngp13.phx.gbl...
>>>>> Page_Init
>>>>>
>>>>> The Page_Init event is the first to occur
>>>>> when an ASP.NET page is executed.
>>>>>
>>>>> This is where you perform any initialization steps that
>>>>> you need to set up or create instances of server controls.
>>>>>
>>>>> You can't access controls in this event because
>>>>> there is no guarantee that they have been created yet.
>>>>>
>>>>> Controls are created during this event, and you can control
>>>>> whether your attempt to use these objects will be denied by
>>>>> the server processing your request.
>>>>>
>>>>> The Page_Init event fires only the first time the page is loaded.
>>>>> When you postback to any page, the Page_Init event doesn't fire.
>>>>>
>>>>> The Page_Load event fires each time the page loads, postback or not.
>>>>>
>>>>> Page_Load
>>>>>
>>>>> This event occurs only when all the objects on the
>>>>> page have been created and are available for use.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Juan T. Llibre, ASP.NET MVP
>>>>> ASP.NET FAQ : http://asp.net.do/faq/
>>>>> Foros de ASP.NET en Espaol : http://asp.net.do/foros/
>>>>> ======================================
>>>>> "Nathan Sokalski" <njsokalski@.hotmail.com> wrote in message
>>>>> news:OLErlmVwFHA.2880@.TK2MSFTNGP12.phx.gbl...
>>>>>> What is the difference between the Page_Init and Page_Load events?
>>>>>> When I was debugging my code, they both seemed to get triggered on
>>>>>> every postback. I am assuming that there is some difference, and I
>>>>>> would like to know what it is so that I can take advantage of it in
>>>>>> my code. Thanks.
>>>>>> --
>>>>>> Nathan Sokalski
>>>>>> njsokalski@.hotmail.com
>>>>>> http://www.nathansokalski.com/
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>

Monday, March 12, 2012

What is the difference between Page_Init and Page_Load?

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