server error related a session RSS

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  navigare

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  server error related a session

  Nov 28, 2012 06:58 PM|LINK

  i get a server error that    "System.NullReferenceException – Object reference not set to an instance of an object"

  and following its

  source error:
  Line 14:        
  Line 15:         
  Line 16: TextBox3.Text = Session["clock"].ToString(); Line 17:         
  Line 18:      
  
  how can i solve this?thnaks for advance. 

  
  

  
  

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  inquisitive_...

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  Re: server error related a session

  Nov 28, 2012 07:36 PM|LINK

  Check for null reference

  TextBox3.Text = Session["clock"] == null ? string.Empty : Session["clock"].ToString();

  
  
  

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  • Edited by navigare on Nov 28, 2012 08:40 PM
  • Edited by navigare on Nov 28, 2012 08:47 PM
  • Marked as answer by Catherine Shan - MSFT on Dec 06, 2012 12:56 AM
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  navigare

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  Re: server error related a session

  Nov 28, 2012 08:09 PM|LINK

   now i ain't getting an error but , i defined  two session following sentences

  TextBox1.Text = Session["kuafor"] == null ? string.Empty : Session["kuafor"].ToString();
  
   TextBox2.Text = Session["saat"] == null ? string.Empty : Session["saat"].ToString();
          first one works,second one doesn't work it returns string.Empty

  • Edited by navigare on Nov 28, 2012 08:12 PM
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  inquisitive_...

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  Re: server error related a session

  Nov 28, 2012 08:20 PM|LINK

  That means that the Session["saat"] is null and has no value in it.Check your code to make sure you are assigning a value into the session i.e. Session["saat"] = "Some Value";

  TextBox2.Text = Session["saat"] == null ? string.Empty : Session["saat"].ToString();

  In the above statement you are checkking the value of Session["saat"] and if it null then you are defaulting the value of TextBox2.Text to string.Empty or else you are assigning the value in Session["saat"].

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  • Edited by inquisitive_mind on Nov 28, 2012 08:23 PM
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  navigare

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  Re: server error related a session

  Nov 28, 2012 08:29 PM|LINK

  i assigned a value to Session["saat"] as below,

  protected void LinkButton1_Click(object sender, EventArgs e)
      {
          Label9.Text = LinkButton1.Text;
          Session["saat"] = Label9.Text;
  
      }

  and i called this way,

  TextBox2.Text = Session["saat"] == null ? string.Empty : Session["saat"].ToString();

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  inquisitive_...

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  Re: server error related a session

  Nov 28, 2012 09:37 PM|LINK

  Did you click the linkbutton and what is the linkbutton text?

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  sureshtalla

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  Re: server error related a session

  Nov 28, 2012 10:03 PM|LINK

  Line 16: TextBox3.Text = Session["clock"].ToString(); Line 17:
  You are not getting any value in that Session["clock"].ToString();
  you need to check first whether it is null or not
  if( Session["clock"].ToString() ==null)
  {
  }
  else
  {

  • Edited by sureshtalla on Nov 28, 2012 10:04 PM
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  oned_gk

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  Re: server error related a session

  Nov 28, 2012 10:07 PM|LINK

  If (Session["clock"]!=null)
  {
  TextBox3.Text = Session["clock"].ToString();
  }

  Programming to simplify, dont look for hard way
  • Edited by oned_gk on Nov 28, 2012 11:45 PM
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  navigare

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  Re: server error related a session

  Nov 29, 2012 10:08 AM|LINK

  Linkbutton.Text=09:00;

  • Edited by navigare on Nov 29, 2012 10:10 AM
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  Catherine Sh...

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  Re: server error related a session

  Dec 04, 2012 06:18 AM|LINK

  Hi,

  navigare

  i assigned a value to Session["saat"] as below,

  protected void LinkButton1_Click(object sender, EventArgs e)
      {
          Label9.Text = LinkButton1.Text;
          Session["saat"] = Label9.Text;
  
      }

  Please set a breakpoint at the code above and check whether LinkButton1.Text is null at first.

  navigare

  Linkbutton.Text=09:00;

  If you want to assign value to linkbutton, you need to convert it to string. Please modify your code above as follows:

  LinkButton1.Text = "09:00";

  Best wishes,

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  • Marked as answer by Catherine Shan - MSFT on Dec 06, 2012 12:57 AM