ASP.NET

1-Jul-09 3:31

Re: Session End

r a m e s h1-Jul-09 7:15

1-Jul-09 7:15

The Session_End event cannnot be handled when the browser is closed.

Some people suggest to handle onbeforeunload javascript event.

But it is not advisable because you cannot differenciate between a postback and browser close(clicking X button).

Also the link button will trigger this event twice.

Re: Session End

Abhijit Jana1-Jul-09 8:08

Abhijit Jana

1-Jul-09 8:08

You don't need to thing about it. It will close automatically when the session is time out !!

cheers,
Abhijit
CodeProject MVP
Web Site:abhijitjana.net
View My Recent Article

Error

<<Tash18>>1-Jul-09 1:37

1-Jul-09 1:37

Thanx Everyone for Replying me and helping me out in my previous posts...
Well now i need an advice from you regarding the following error that i have received...
I actually Try 2 insert a record from my asp page with the same details that already exists in the table.. how do i handle this exception. i dont have a proper idea regarding handling errors... Do please help... i receive the following error...
"Violation of PRIMARY KEY constraint 'PK__studentreg__0BE6BFCF'. Cannot insert duplicate key in object 'dbo.studentreg'"
thanx in advance...

Re: Error [modified]

r a m e s h1-Jul-09 1:43

1-Jul-09 1:43

The exception clearly says that you are violating primary key constraint.

A simple way is to put try catch statement aroung your table inserting code.

Then handle SqlException and check the value of the Number property of the SqlException object if it equals to 2627.

try
 {
  //your db insert code goes here

 }
catch(SqlException ex)
 {
   
    if (ex.Number.Equals(2627))   
    {
       // Display your error here
    }
}

modified on Wednesday, July 1, 2009 8:16 AM

<<Tash18>>1-Jul-09 3:19

1-Jul-09 3:19

Thanx alot... It worked out...

Manas Bhardwaj1-Jul-09 1:43

Manas Bhardwaj

1-Jul-09 1:43

You need to check if the record exists for the primary key.
Only do a insert if the record does not exist. In other case, update the existing information (if it suits your application needs)

Manas Bhardwaj
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<<Tash18>>1-Jul-09 1:45

1-Jul-09 1:45

Is it possible to post a msg to the user using a label stating that the record already exists..

K03061-Jul-09 1:59

K0306

1-Jul-09 1:59

Yes, First you could check whether the Record exists using Primary Key Field,if exist then display the msg in label,if not add it.

<<Tash18>>1-Jul-09 2:24

1-Jul-09 2:24

Thanx for help...
Things are fine now...

Session closed

zeeShan anSari1-Jul-09 1:33

1-Jul-09 1:33

hi,
how to i determine that session is closing in asp.net?
i want do something when session is closing.......as in desktop application where fromclosing call

thanks

Re: Session closed

SeMartens1-Jul-09 1:35

SeMartens

1-Jul-09 1:35

Have a look at the global.asax file. There should be a method named "void Session_End(object sender, EventArgs e)". That's the one called by the engine whenever a session is closing/ends.

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Session closed

zeeShan anSari1-Jul-09 1:44

1-Jul-09 1:44

where can i find global.asax file.

Re: Session closed

zeeShan anSari1-Jul-09 1:54

displaying a pdf document using an Iframe

1-Jul-09 1:54

ok i find it

LucBite1-Jul-09 1:13

LucBite

1-Jul-09 1:13

I want to display a pdf/word document on my web page. My attempt was with an Iframe, where by under the "protected void ddlBasicConcept_SelectedIndexChanged(object sender, EventArgs e)", a dropdownlist event, I have the code " frmWord.Attributes["src"] = "C:/Documents and Settings/user.RESEARCHCEN/LearningConcepts/Variables[1].doc" where "frmword" is my Iframe name. well I'm not getting any error from this code,, yet it does not display anything on the Iframe.Please help

ML Lingwati

Re: displaying a pdf document using an Iframe

koolprasad20031-Jul-09 1:24

koolprasad2003

1-Jul-09 1:24

LucBite wrote:
frmWord.Attributes["src"] = "C:/Documents and Settings/user.RESEARCHCEN/LearningConcepts/Variables[1].doc"

your code is right just change location of your PDF/DOC file

- create a folder under your APP_Code folder
- put that file in that newly created folder
- now give like this

frmWord.Attributes["src"] = "../Variables[1].doc

and see the effect

hope it helps

regards
koolprasad2003 Smile | :)

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How to Open a WebForm on Calendar_0nSelectionChanged

vandanaconedify1-Jul-09 1:02

vandanaconedify

1-Jul-09 1:02

I want to open a dialog box / WEBFORM when user selects/Clicks on a date in Calendar control.

Re: How to Open a WebForm on Calendar_0nSelectionChanged

r a m e s h1-Jul-09 1:39

how to set Autopostback false on calendar_OnSelectionChanged

1-Jul-09 1:39

Use Page.ClientScript.RegisterStartupScript method to emit the javascript to open a popup in the OnSelectionChanged event of the Calendar.

DataView error:

padmanabhan N1-Jul-09 0:20

padmanabhan N

1-Jul-09 0:20

Hi experts,

I am having a column name as Firstname/LastName, i am trying to filter this column using DataView.

DataView dv = new DataView(dtTemptable, "" + dtTemptable.Columns[1] + " in ('" + name + "')", null, DataViewRowState.CurrentRows);

I am getting an error:
Cannot find column [Firstname]. //i even used the column name diretly.

Padmanabhan
My Articles:
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My latest Article:
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vandanaconedify30-Jun-09 23:48

vandanaconedify

30-Jun-09 23:48

I seem to be having a problem with getting the Calendar control that
comes with Visual Studio to trap for the OnSelectionChanged event. When
I click on a date in the calendar a postback is made and control goes
back to the first page of my application. It never reaches the code for
the event. There is no property "AutoPostBack" for my Calendar control
so I can not set it to false.

Re: how to set Autopostback false on calendar_OnSelectionChanged

r a m e s h1-Jul-09 0:25

Re: how to set Autopostback false on calendar_OnSelectionChanged

1-Jul-09 0:25

Calendar Web server control will do postback when you select a date.

You cannot avoid it.

r a m e s h1-Jul-09 0:27