"Hcan" <hcan@hotmail.com> wrote in message
news:FmvEe.142596$dP1.495964@newsc.telia.net...
>I have a custom collection that inherits from CollectionBase. It is bound
>to a DataGrid, and now I want to disable the append row in the DataGrid.
>The way I was going to do it is to set the DataView AllowNew property to
>False. Something like this:
>
> Dim myCollection as Collection
> myCollection.Fill()
> DataGrid1.DataSource = myCollection
> Dim cm As CurrencyManage
> cm = CType(BindingContext(myCollection), CurrencyManager)
> Dim dv As DataView
> dv = CType(cm.List, DataView)
> dv.AllowNew = False
>
> When the cast is from cm.List to DataView, I get this error: Specified
> cast is not valid.
>
> Anyone knows why?

>
>
>
> -H
>
>
>
>

> Hi,
>
> "Hcan" <hcan@hotmail.com> wrote in message
> news:FmvEe.142596$dP1.495964@newsc.telia.net...
>>I have a custom collection that inherits from CollectionBase. It is bound
>>to a DataGrid, and now I want to disable the append row in the DataGrid.
>>The way I was going to do it is to set the DataView AllowNew property to
>>False. Something like this:
>>
>> Dim myCollection as Collection
>> myCollection.Fill()
>> DataGrid1.DataSource = myCollection
>> Dim cm As CurrencyManage
>> cm = CType(BindingContext(myCollection), CurrencyManager)
>> Dim dv As DataView
>> dv = CType(cm.List, DataView)
>> dv.AllowNew = False
>>
>> When the cast is from cm.List to DataView, I get this error: Specified
>> cast is not valid.
>>
>> Anyone knows why?
>
> A DataView can only be used with a DataTable, not a custom collection.
>
> Your custom collection does implement IList which means that it binds
> _directly_ to the grid. And currencyManager.List just returns your custom
> collection not a DataView.
>
> Without seeing your custom collection code, i can only guess that you
> implemented IBindingList and returned true for IBindingList.AllowNew (and
> IBindingList.SupportsChangeNotification), because you're saying the grid
> allows new entries to be added.
>
> So, instead of returning true for IBindingList.AllowNew, if you haven't
> already, make a get and set for that property, so you can change it, if it
> returns false the grid won't allow new entries.
>
>
> HTH,
> greetings
>
>>
>>
>>
>> -H
>>
>>
>>
>>
>
>