ASP updatepanel and OPC

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Hi All,

Being my first post here, I'd like to say hello. :-D

I'm working on a ASP.NET project and I wan't to read OPC-DA data. The data reading works fine, but I can't get the updatepanel to refresh automatically.

When new data arrives, a 'DataChange' event is thrown by the 'OpcGroup' object. In this event I want to refresh the update panel manually (conditional). So I've set the updatemode=conditional on the UpdatePanel1. When I click the update button with my mouse, the update works. But when I click the button programmatically, the update doesn't work.

Does anyone have an idea why this doesn't work (or a better idea)?

VB

Private Sub objOpcGrps_DataChange(ByVal TransactionID As Integer, ByVal NumItems As Integer, ByRef ClientHandles As System.Array, ByRef ItemValues As System.Array, ByRef Qualities As System.Array, ByRef TimeStamps As System.Array) Handles objOpcGrp.DataChange
    'declaration
    Dim i As Integer
    'update status tags
    For i = 1 To ClientHandles.Length
        If ClientHandles(i) = 1 Then txtWaarde3.Text = ItemValues(i)
        If ClientHandles(i) = 2 Then txtWaarde3.Text = ItemValues(i)
    Next
    'Click update button to refresh updatepanel
    btnUpdate_Click(btnUpdate, New System.EventArgs)
End Sub

SQL

Protected Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdate.Click
    UpdatePanel1.Update()
End Sub

Posted 27-Dec-10 22:36pm

PierkeDenDabber

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Sandeep Mewara · Answer 1 · 2010-12-27T22:54:00

Call the update of other update panel directly.
Try:

VB

Private Sub objOpcGrps_DataChange(ByVal TransactionID As Integer, ByVal NumItems As Integer, ByRef ClientHandles As System.Array, ByRef ItemValues As System.Array, ByRef Qualities As System.Array, ByRef TimeStamps As System.Array) Handles objOpcGrp.DataChange
    'declaration
    Dim i As Integer
    'update status tags
    For i = 1 To ClientHandles.Length
        If ClientHandles(i) = 1 Then txtWaarde3.Text = ItemValues(i)
        If ClientHandles(i) = 2 Then txtWaarde3.Text = ItemValues(i)
    Next
    ' Call the update of the other update panel here itself
    UpdatePanel1.Update()
End Sub

The reason it does not work as you intend to is because of the page life-cycle and the way and when the click has been called for.

PierkeDenDabber · Answer 2 · 2010-12-28T00:35:00

Solution 2

This isn't working either.

Now I get error: The Update method can only be called on UpdatePanel with ID 'UpdatePanel1' before Render.

Posted 28-Dec-10 0:35am