setting DataSource fires 'SlectedIndexChanged' event too!

[TF]

hi,
i am using a ListBox control on a windows form using VB.Net. when i
set the DataSource property of the control to an ArrayList it fires
following events in this order:
SelectedIndexCh anged
SelectedIndexCh anged
DataSourceChang ed
SelectedIndexCh anged

is there any way to check in SelectedIndexCh anged event handler that
if event is fired while setting DataSource property or user has
actually changed the item? SelectedIndex property doesn't work 'cause
it is already set to '0'.

BTW, why SelectedIndexCh anged is fired 3-times?

Any help...
Thanks
TF

[John Cottrell]

setting DataSource fires 'SlectedIndexCh anged' event too!

I have experienced this same problem in the past and have
resolved the issue by using a no-so-elegant but workable
solution using a module level boolean variable.

For example, declare a variable in your form as such...

Private mboolSettingDat aSource As Boolean = False

Then prior to setting the DataSource property set the
variable to True then after setting the DataSource
property set the variable back to False.

Then at the begining of the SelectedIndexCh anged event
place a code snipet like...

If mboolSettingDat aSource Then
Exit Sub
End If

FWIW: I believe the reason the SelectedIndexCh anged event
fires multiple times is because internally the DataSource
property actually changes the SelectedIndex porperty
(probably once for each element in the array).

I hope this helps!
[color=blue]
>-----Original Message-----
>hi,
>i am using a ListBox control on a windows form using[/color]
VB.Net. when i[color=blue]
>set the DataSource property of the control to an[/color]
ArrayList it fires[color=blue]
>following events in this order:
>SelectedIndexC hanged
>SelectedIndexC hanged
>DataSourceChan ged
>SelectedIndexC hanged
>
>is there any way to check in SelectedIndexCh anged event[/color]
handler that[color=blue]
>if event is fired while setting DataSource property or[/color]
user has[color=blue]
>actually changed the item? SelectedIndex property doesn't[/color]
work 'cause[color=blue]
>it is already set to '0'.
>
>BTW, why SelectedIndexCh anged is fired 3-times?
>
>Any help...
>Thanks
>TF
>.
>[/color]

[TF]

Re: setting DataSource fires 'SlectedIndexCh anged' event too!

yes, i did same sort of thing but i was wondering if i am missing something.

Thanks for reply