How to check whether session exists or not? RSS

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  rpk2006

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  629 Posts

  How to check whether session exists or not?

  Mar 02, 2012 04:46 AM|LINK

  I want to check whether Session("RecordID") exists or not. If it does not exist, I want to create a new Session else I want to assign value to an existing session.

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  Mahesh Darku...

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  238 Posts

  Re: How to check whether session exists or not?

  Mar 02, 2012 04:49 AM|LINK

  if(session["RecordID"] == NULL)

  {

  }

  else

  {

  }

  if it is work for you plz mark as answer..
  • Marked as answer by Qi Wu - MSFT on Mar 09, 2012 01:33 AM
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  mishra.bhupe...

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  Re: How to check whether session exists or not?

  Mar 02, 2012 05:02 AM|LINK

  Try

  {

  string val=Session["RecordID"].toString();

  //if null i will throw nullreference exception

  //code to assing some new value

  Session.Add("RecordID",newval);

  }

  catch(Exception)

  {

  //it is null

  //code you want to do

  }

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  Echo88

  Participant

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  Re: How to check whether session exists or not?

  Mar 03, 2012 06:29 PM|LINK

  You should always avoid throwing an exception  - it is better just to check if the key maps to null as Mahesh did.

  2 wrongs don't make a right - but three lefts do
  • Edited by Echo88 on Mar 03, 2012 06:31 PM
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  chalakiblog

  Member

  30 Points

  9 Posts

  Re: How to check whether session exists or not?

  Mar 04, 2012 01:14 PM|LINK

  if (Session["mySessionVar"] != null) {            

       OutputLabel.Text = (String)Session["mySessionVar"];

  }

  in VB:

  if Session["mySessionVar"] Not null then       

      OutputLabel.Text = Session["mySessionVar"] as String

  end if

  • You should check for null
  • you should always cast the Object into the Actual Type of the variable
  Learn ASP.NET/C#/VB using Chalaki's ASP.NET Online Classes.