multi threading and AJAX

  • Thread starter Thread starter Bruno Alexandre
  • Start date Start date
B

Bruno Alexandre

Hi guys,

I have this page that needs to be populated with 2 diferent web services,
and each one takes more or less 10 seconds to finish populate his own part,
so I move on to the multi threading inside ASP.NET.

my questions is:

having a ASP.NET AJAX page and my gridView inside an atlas:UpdatePanel
control how can I update the panel so it shows the datagrid with the results
from the webservice?

Sub callDRService()
Dim dr As New drService
dr.getDRInfoFromWebService("John", "Hansen", "Nørregade 86", "5700",
False)
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
End Sub

the up control is a UpdatePanel, but at the end of the thread the panel
simple wont update :-(

any thoughts?


code for page_load and thread call
-------------------------
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load
populateDRFromWService_Thread()
End Sub
Public Sub populateDRFromWService_Thread()
Dim NewThread As Thread = New Thread(AddressOf callDRService)
NewThread.Priority = ThreadPriority.Lowest
NewThread.Start()
End Sub
-------------------------
--

Bruno Alexandre
København, Danmark

"a portuguese in Denmark"
 
Interesting. This is probably not related to AJAX though. It probably is
related to the timing of the thread and the update call. Wrap your bind code
in a null check to make sure data is back before you call the update. That
will eliminate or confirm the timing issue.

if(dr.warningTable IsNotNull And dr.warningTable[0].rows.count > 0) then
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
end if

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
 
the problem remains...
after the page is completed, I can't update anything on it. even an
UpdatePanel :-(

what I did was wait for the 2 threads to finish and then show the page.
with MultiThreading I get the page shows up in aprox 4sec instead of the
9/12 sec before

not what I was searching in the first place - I want to present the page and
a progress bar saying that the webservice call is still running and when it
finish populate the gridview with all the info. but, I coudn't do that
yet... :-(



--

Bruno Alexandre
København, Danmark

"a Portuguese in Denmark"

Blog. http://balexandre.blogspot.com/
Photos. http://www.flickr.com/photos/balexandre/


Alvin Bruney said:
Interesting. This is probably not related to AJAX though. It probably is
related to the timing of the thread and the update call. Wrap your bind
code in a null check to make sure data is back before you call the update.
That will eliminate or confirm the timing issue.

if(dr.warningTable IsNotNull And dr.warningTable[0].rows.count > 0) then
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
end if

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------


Bruno Alexandre said:
Hi guys,

I have this page that needs to be populated with 2 diferent web services,
and each one takes more or less 10 seconds to finish populate his own
part, so I move on to the multi threading inside ASP.NET.

my questions is:

having a ASP.NET AJAX page and my gridView inside an atlas:UpdatePanel
control how can I update the panel so it shows the datagrid with the
results from the webservice?

Sub callDRService()
Dim dr As New drService
dr.getDRInfoFromWebService("John", "Hansen", "Nørregade 86", "5700",
False)
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
End Sub

the up control is a UpdatePanel, but at the end of the thread the panel
simple wont update :-(

any thoughts?


code for page_load and thread call
-------------------------
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
populateDRFromWService_Thread()
End Sub
Public Sub populateDRFromWService_Thread()
Dim NewThread As Thread = New Thread(AddressOf callDRService)
NewThread.Priority = ThreadPriority.Lowest
NewThread.Start()
End Sub
-------------------------
--

Bruno Alexandre
København, Danmark

"a portuguese in Denmark"
Click to expand...
Click to expand...
 
post a short but complete program that demonstrates the problem. Short but
complete programs are defined here:
http://www.yoda.arachsys.com/csharp/complete.html

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------


Bruno Alexandre said:
the problem remains...
after the page is completed, I can't update anything on it. even an
UpdatePanel :-(

what I did was wait for the 2 threads to finish and then show the page.
with MultiThreading I get the page shows up in aprox 4sec instead of the
9/12 sec before

not what I was searching in the first place - I want to present the page
and a progress bar saying that the webservice call is still running and
when it finish populate the gridview with all the info. but, I coudn't do
that yet... :-(



--

Bruno Alexandre
København, Danmark

"a Portuguese in Denmark"

Blog. http://balexandre.blogspot.com/
Photos. http://www.flickr.com/photos/balexandre/


Alvin Bruney said:
Interesting. This is probably not related to AJAX though. It probably is
related to the timing of the thread and the update call. Wrap your bind
code in a null check to make sure data is back before you call the
update. That will eliminate or confirm the timing issue.

if(dr.warningTable IsNotNull And dr.warningTable[0].rows.count > 0) then
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
end if

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------


Bruno Alexandre said:
Hi guys,

I have this page that needs to be populated with 2 diferent web
services, and each one takes more or less 10 seconds to finish populate
his own part, so I move on to the multi threading inside ASP.NET.

my questions is:

having a ASP.NET AJAX page and my gridView inside an atlas:UpdatePanel
control how can I update the panel so it shows the datagrid with the
results from the webservice?

Sub callDRService()
Dim dr As New drService
dr.getDRInfoFromWebService("John", "Hansen", "Nørregade 86", "5700",
False)
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
End Sub

the up control is a UpdatePanel, but at the end of the thread the panel
simple wont update :-(

any thoughts?


code for page_load and thread call
-------------------------
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
populateDRFromWService_Thread()
End Sub
Public Sub populateDRFromWService_Thread()
Dim NewThread As Thread = New Thread(AddressOf callDRService)
NewThread.Priority = ThreadPriority.Lowest
NewThread.Start()
End Sub
-------------------------
--

Bruno Alexandre
København, Danmark

"a portuguese in Denmark"
Click to expand...
Click to expand...
Click to expand...
 
this can't be for me right?
I gave the code, you gave me a response, and then I told what exactly I did
to get arround my problem!

maybe you just miss it.

--

Bruno Alexandre
København, Danmark

"a Portuguese in Denmark"

Blog. http://balexandre.blogspot.com/
Photos. http://www.flickr.com/photos/balexandre/


Alvin Bruney said:
post a short but complete program that demonstrates the problem. Short but
complete programs are defined here:
http://www.yoda.arachsys.com/csharp/complete.html

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------


Bruno Alexandre said:
the problem remains...
after the page is completed, I can't update anything on it. even an
UpdatePanel :-(

what I did was wait for the 2 threads to finish and then show the page.
with MultiThreading I get the page shows up in aprox 4sec instead of the
9/12 sec before

not what I was searching in the first place - I want to present the page
and a progress bar saying that the webservice call is still running and
when it finish populate the gridview with all the info. but, I coudn't do
that yet... :-(



--

Bruno Alexandre
København, Danmark

"a Portuguese in Denmark"

Blog. http://balexandre.blogspot.com/
Photos. http://www.flickr.com/photos/balexandre/


Alvin Bruney said:
Interesting. This is probably not related to AJAX though. It probably is
related to the timing of the thread and the update call. Wrap your bind
code in a null check to make sure data is back before you call the
update. That will eliminate or confirm the timing issue.

if(dr.warningTable IsNotNull And dr.warningTable[0].rows.count > 0) then
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
end if

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------


Hi guys,

I have this page that needs to be populated with 2 diferent web
services, and each one takes more or less 10 seconds to finish populate
his own part, so I move on to the multi threading inside ASP.NET.

my questions is:

having a ASP.NET AJAX page and my gridView inside an atlas:UpdatePanel
control how can I update the panel so it shows the datagrid with the
results from the webservice?

Sub callDRService()
Dim dr As New drService
dr.getDRInfoFromWebService("John", "Hansen", "Nørregade 86", "5700",
False)
gvDRWarnings.DataSource = dr.warningTable
gvDRWarnings.DataBind()
up.Update()
End Sub

the up control is a UpdatePanel, but at the end of the thread the panel
simple wont update :-(

any thoughts?


code for page_load and thread call
-------------------------
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
populateDRFromWService_Thread()
End Sub
Public Sub populateDRFromWService_Thread()
Dim NewThread As Thread = New Thread(AddressOf callDRService)
NewThread.Priority = ThreadPriority.Lowest
NewThread.Start()
End Sub
-------------------------
--

Bruno Alexandre
København, Danmark

"a portuguese in Denmark"
Click to expand...
Click to expand...
Click to expand...
 
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