Events firing order in .NET application, help needed!

[John Martin]

I've made an .NET application where the contents of a datagrid (dgr1)
is changed when the user changes the selection in a drop-down list
(drd1). This has works fine as a beginning.
Then I want to manipulate the look of the datagrid.
I do this in the ItemCreated event, and on the first run (application
start) this works as supposed. But when a selection is made in drd1, I
find during debugging that the dgr1_ItemCreate d event is fired before
the drd1_SelectedIn dexChanged. Since the update of the dataset is
performed in the SelectedIndexCh anged event, this results in an error.
Why are the events fired in this order? To me it seems obvious that
the SelectedIndexCh anged event should be fired first, or???

This is parts of my code showing the two events:

Private Sub Dgr1_ItemCreate d(ByVal sender As Object, ByVal e As
System.Web.UI.W ebControls.Data GridItemEventAr gs) Handles
Dgr1.ItemCreate d

Dim MyObj As Object

If e.Item.ItemType = ListItemType.He ader Then
e.Item.Font.Ita lic = True
e.Item.Font.Bol d = True
End If

If Not ((e.Item.ItemTy pe.ToString() = "Header") Or
(e.Item.ItemTyp e.ToString() = "Footer")) Then
MyObj = CType(e.Item.Da taItem, Object)
' Dummy declared at page level
If Dummy <> MyObj.row.itema rray(0) Then
Dummy = MyObj.row.itema rray(0)
Else
e.Item.Visible = False

End If
End If
End Sub

Private Sub drd1_SelectedIn dexChanged(ByVa l sender As System.Object,
ByVal e As System.EventArg s) Handles cmbCategory.Sel ectedIndexChang ed

'Update parameter
SqlDataAdapter1 .SelectCommand. Parameters(1).V alue =
drd1.SelectedIt em.Value
'Update Dataset1
DataSet1.Clear( )
SqlDataAdapter1 .Fill(DataSet1)
Drg1.DataBind()

End sub
Any suggestions how to fix this?
Regards,

John Martin

[Teemu Keiski]

Well...no. :-)

ItemCreated is called whenever DataGridItem is created, that happens when
grid is databound (items created based on datasource) and when DataGrid is
restored from ViewState (happens at LoadViewState phase before Page_Load).
It means ItemCreated event can even be raised more than once during a
request (grid is restored from ViewState and again rebound based on certain
action when it happensd twice).

ItemDataBound again is raised only when DataGrid is databound, that is,
DataBind() is called.

--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist

"John Martin" <jm*@larvikbank en.no> wrote in message
news:f8******** *************** ***@posting.goo gle.com...

I've made an .NET application where the contents of a datagrid (dgr1)
is changed when the user changes the selection in a drop-down list
(drd1). This has works fine as a beginning.
Then I want to manipulate the look of the datagrid.
I do this in the ItemCreated event, and on the first run (application
start) this works as supposed. But when a selection is made in drd1, I
find during debugging that the dgr1_ItemCreate d event is fired before
the drd1_SelectedIn dexChanged. Since the update of the dataset is
performed in the SelectedIndexCh anged event, this results in an error.
Why are the events fired in this order? To me it seems obvious that
the SelectedIndexCh anged event should be fired first, or???

This is parts of my code showing the two events:

Private Sub Dgr1_ItemCreate d(ByVal sender As Object, ByVal e As
System.Web.UI.W ebControls.Data GridItemEventAr gs) Handles
Dgr1.ItemCreate d

Dim MyObj As Object

If e.Item.ItemType = ListItemType.He ader Then
e.Item.Font.Ita lic = True
e.Item.Font.Bol d = True
End If

If Not ((e.Item.ItemTy pe.ToString() = "Header") Or
(e.Item.ItemTyp e.ToString() = "Footer")) Then
MyObj = CType(e.Item.Da taItem, Object)
' Dummy declared at page level
If Dummy <> MyObj.row.itema rray(0) Then
Dummy = MyObj.row.itema rray(0)
Else
e.Item.Visible = False

End If
End If
End Sub

Private Sub drd1_SelectedIn dexChanged(ByVa l sender As System.Object,
ByVal e As System.EventArg s) Handles cmbCategory.Sel ectedIndexChang ed

'Update parameter
SqlDataAdapter1 .SelectCommand. Parameters(1).V alue =
drd1.SelectedIt em.Value
'Update Dataset1
DataSet1.Clear( )
SqlDataAdapter1 .Fill(DataSet1)
Drg1.DataBind()

End sub
Any suggestions how to fix this?
Regards,

John Martin