Web service with timer

[jmclean22]

Hi Bytes Crew,
I was told to do a web service with a timer. The timer has to be executed every 30 seconds to get information from a Database. So, when a user makes a request to the web service, the information has to be provided by a dataset and no from the Database. Is there any example of a web service with timer? I just created the web service but no sure how to add a timer and makes it works.
any help is really appreaciated.
JM

[zmbd]

see if any of this tickles your fancy

http://msdn.microsoft.com/en-us/library/system.web.ui.timer.aspx

[jmclean22]

Hi zmbd, I looked up at the info you sent and I did this, can you let me know if Im in the right track, please? Here is my web service with the timer:

Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel
Imports System.Timers

' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
' <System.Web.Script.Services.ScriptService()> _
<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class WebService1
    Inherits System.Web.Services.WebService

    Shared ds As DataSet = New DataSet()
    Private Shared tmrGetPending As Timer

    Shared Sub New()
        tmrGetPending.Start()
        tmrGetPending.Interval = 5000
        AddHandler tmrGetPending.Elapsed, AddressOf tmrGetPending_Elapsed
    End Sub

    Private Shared Sub tmrGetPending_Elapsed(ByVal sender As Object, ByVal e As EventArgs)
        ds = GetData()
    End Sub

    <WebMethod()> _
    Public Function GetPending() As DataSet
        Return ds
    End Function

    Public Shared Function GetData() As DataSet
        'Dim connStr As String = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Return ds
    End Function
End Class

With the interval option set to 5000, it means that the timer will be fired every time 5000 automatically?
The function GetData is the one that will be getting the info from the database.
the sub tmrgetpending_e lapsed will be fired every 5000 as set in the interval?
the function getpending is the one used to call from the client.
I have a sub new that set the timer and interval.

[zmbd]

I'm still fairly new to .net stuff so hopefully one of the more knowledgable will be able to double check things for you.