Global.asax application variables RSS

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  shtrudel

  Member

  461 Points

  540 Posts

  Global.asax application variables

  Apr 29, 2012 01:07 PM|LINK

  Hi there,

  In my global.asax Application_start method I set an application variable, then I set a timer object that calls a routine that check for the application variable but I always get an error when checking the application variable.

  Code follows-

  --- Global.asax ---

  Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
          ' Code that runs on application startup
          Dim a = New generalWebService
          
          HttpContext.Current.Application("usersOnline") = a.newOnlineUsersTable
          a.setTimer()
          
      End Sub

  --- generalWebService ---

  Public Sub setTimer()
          Dim t As New Timer(30000)
          AddHandler t.Elapsed, New ElapsedEventHandler(AddressOf checkOnlineUsersTable)
          t.Enabled = True
      End Sub

  Private Sub checkOnlineUsersTable()
   
          If Not HttpContext.Current.Application("usersOnline") Is Nothing Then
              Dim t As New DataTable
              t = HttpContext.Current.Application("usersOnline")
              If t.Rows.Count > 0 Then
                  For Each r As DataRow In t.Rows
                      Dim ts As New TimeSpan(Now.Ticks - r("lastseen"))
                      If ts.Minutes > 2 Then
                          t.Rows.Remove(r)
                      End If
                  Next
              End If
          End If
   
      End Sub

  I am getting the error on the red line.

  Any idea why ?

  Cheers
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  Shoaib.Rashi...

  Member

  130 Points

  41 Posts

  Re: Global.asax application variables

  Apr 29, 2012 01:18 PM|LINK

  Please post error message

  Please "Mark It As Answer" if this post is helpful for you this will save time for others
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  Shoaib.Rashi...

  Member

  130 Points

  41 Posts

  Re: Global.asax application variables

  Apr 29, 2012 01:19 PM|LINK

  Please post error message

  Please "Mark It As Answer" if this post is helpful for you this will save time for others
• • Reply
  

  shtrudel

  Member

  461 Points

  540 Posts

  Re: Global.asax application variables

  Apr 29, 2012 01:25 PM|LINK

  Error message follows:

  System.NullReferenceException was unhandled by user code
    Message=Object reference not set to an instance of an object.

  Cheers