Question

ASP.NET Session

Asked by: shpresa

I have a RetriveParticipant page, which has a Onlcik even on a button with the following info:
protected void AddCollection_Click(object sender, EventArgs e)
    {
        Session["sParticipantID"] = lblParticipantID.Text;
        Session["sCollectionType"] = ddlCollectionType.SelectedValue;
        Session["sCollectionDate"] = txtCollectionDate.Text;
        Response.Redirect("RetriveSurvey.aspx", false);
    }

I am supossly storing the fields into the session.
On the RetriveSurvey.asp page, I am binding and saving a survey for each participantID.
on if (!Page.IsPostBack) // i have
        {
 lblParticipantID.Text = Session["sParticipantID"].ToString();
lblSurveyID1.Text = Session["SurveyID"].ToString();
}

On binding the survey, i am just cheking for :
 private void Bind_Survey()
    {
        if ((Session["SurveyID"] != null) && (Session["sParticipantID"]) != null)
        {
            btn_Submit.Visible = false;
            SqlCommand cmdSurvey;
            cmdSurvey = new SqlCommand("spRetrieveSurvey", myConnection);
            cmdSurvey.CommandType = CommandType.StoredProcedure;
            cmdSurvey.Parameters.Add(new SqlParameter("@ParticipantID", Session["sParticipantID"].ToString()));
            cmdSurvey.Parameters.Add(new SqlParameter("@SurveyID", Session["SurveyID"].ToString()));

adn so ..... on

on the other hand, to save a new survey I have
  protected void Save_CollectionPoint_SurveyInfo_Click()
    {
        if ((Session["sParticipant"]) != null)
        {

and so on.....


Seems like it works sometimes and it doesent in the same time.
When I click to add a new survey, it gives me the previews survey with the retrive data i had saved before. Sometimes it logs me out.
How would i manage this problem?
Let me know if yo have any other question.
Thanks in advance

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Asked On
2009-09-30 at 15:11:10ID24775387
Tags

ASP.NET Session

Topics

Programming for ASP.NET

,

SQL Server 2005

,

Microsoft Visual C#.Net

Participating Experts
3
Points
500
Comments
7

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Answers

 

by: j_a_jimenezPosted on 2009-09-30 at 15:50:05ID: 25464422

Check the Connection timeout in IIS Web Site Properties

 

by: j_a_jimenezPosted on 2009-09-30 at 15:51:21ID: 25464428

also check the Enable Session State and Session timeout properties in Application Configuration

 

by: funwithdotnetPosted on 2009-09-30 at 18:26:52ID: 25465359

... and if none of the above solves the issue, remember that the application may automatically recycle for a number of reasons- number of requests & time come to mind. In IIS7, fine-grain control of recycling conditions is in the interface. Also, if an application 'leaks' memory (and possibly other resources), it will eventually demand too much and trigger an automatic recyce. There is no control of that, except by preventing a leak.

 

by: shpresaPosted on 2009-10-01 at 09:17:25ID: 25470260

this is what i have for session:
<sessionState mode="InProc" timeout="18000"/>
in configfile.
what is a good number to put the session timeout?

 

by: burakiewiczPosted on 2009-10-01 at 09:46:40ID: 25470578

also check the iis app pool setting, under performance if the web garden max number of process is more that one you will be having the same problem.  if it is you will need to use sql for sessions

 

by: j_a_jimenezPosted on 2009-10-01 at 11:32:46ID: 25471723

Check this:

When using the in-process session-state mode, session-state data is lost if aspnet_wp.exe or the application domain restarts. These restarts commonly occur in the following circumstances:

-Setting an attribute in the <processModel> element of the application's Web.config file that causes a new process to start when a condition is met, such as memoryLimit.

-The Global.asax or Web.config file is modified.

-Changes to the \Bin directory of the Web application.

-Antivirus software scans and modifies the Global.asax file, the Web.config file, or a file in the \Bin directory of the Web application.    

From: http://msdn.microsoft.com/en-us/library/87069683(VS.71).aspx

 

by: burakiewiczPosted on 2009-10-01 at 17:01:48ID: 25474269

also if you are using a load balancer the to use multiple servers the session can be lost using inproc

20120131-EE-VQP-002

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