Managing sessions [Answered]RSS

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  aadidev

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  Managing sessions

  Jan 26, 2011 02:06 AM|aadidev|LINK

  Hi,

    I am building a website .When a user login i am passing two sessions(Session["uid"],Session["uname"]) across pages and i am fetching these values in different pages and depending on these values further processing is made.In the page load event of all the pages where i am fetching this session to a variable, i have wrote

   if ((Session["uid"].ToString() == "") || (Session["uid"].ToString() == null)||(Session["uname"].ToString() == "") || (Session["uname"].ToString() == null))
          {
              Response.Redirect("index.aspx");
          }

  
  

  but at times when i use the back arrow of the browser an error is coming "Object reference not set to an instance of an object".ie , the session value is empty but it is not redirecting to the index page.Why this is happening and how can i overcome this.what can i do to keep the Session value across pages if if the user uses the browser back and forward arrow.This is very important because the session cannot be empty because it affects the further processing

  pls help and thanks in advance
  

  Managing sessions

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  NikxGupta

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  86 Posts

  Re: Managing sessions

  Jan 26, 2011 03:15 AM|NikxGupta|LINK

  u should not use Session["keyname"].ToString() as when Session["keyname"] is null it will throw an exception

  check directly for null  if( Session["keyname"] == null)

  Also once u created the session it cannot be automatically empty ur using right approach

  check your session timeout settings and increase it if neccessary in web.config

  <sessionState timeout="">

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  sirdneo

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  Re: Managing sessions

  Jan 26, 2011 06:25 AM|sirdneo|LINK

  You should check null in seperate if and blank string in seperate if like this:-

  
  

  bool moveToIndexPage= false;
              if (Session["UID"] == null || Session["uname"] == null)
              {
                  moveToIndexPage = true;
              }
              else if (Session["UID"].ToString() == "" || Session["uname"].ToString() == null)
              {
                  moveToIndexPage = true;
              }
              if (moveToIndexPage)
              {
                  Response.Redirect("index.aspx");
              }

  
  Reason is that if session["uid"] is null then .ToString() will give exception, so i first checked that these values are not null.
  

  Thanks,
  Zeeshan Umar
  ~Please Mark As Answer, one or multiple posts, which helped you. So that it might be useful for others~
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  sovitmittal

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  Re: Managing sessions

  Jan 27, 2011 12:55 AM|sovitmittal|LINK

  Hi,

  .ToString() method does not handle the NULL  that why it will throw the error so check the null only otherwise if you want to check the Empty string also then use to Convert.ToString() method.

  Hope it would be helpfull.
  

  
  

  
  

  
  

  Sovit Mittal | My Blog
  Mark the post as Answer if it helped you.
  
  
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  nilsan

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  Re: Managing sessions

  Jan 27, 2011 12:58 AM|nilsan|LINK

  You can alternatively use Global.asax Application_BeginRequest event to check for null session rather than writting it in each and every page. Check for null, if it is redirect to the page you want.

  I hope it makes sense!! :)

  Nilesh
  Blog | Get your forum question answered | Microsoft Community Contributor 2011
  
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  vaibhav_shah...

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  112 Posts

  Re: Managing sessions

  Jan 27, 2011 01:36 AM|vaibhav_shah1988|LINK

  Just remove .ToString() from session varibale of your code ...then it will work propetly.
  

  
  

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