RE: CompositeDataBoundControl and "Failed to load viewstate"

Hi,

Using Dino's sample
http://localhost/ProAspNetAdv/Samples/Ch14/BarChart/TestBarChart.aspx for
example, if you add a breakpoint in BarChart.cs: CreateControlHierarchy:
after the barchart gets loaded, click "Just post back": you will notice the
"dataBinding" is false but "dataSource" contains 9 null item in an array.
This 9 is returned in previous call to this CreateControlHierarchy when
"dataBinding" is true. In this case, although the data is null, but the
BarCharItems still get created correctly.

As far as I know, DataBind() must be called for the
CompositeDataboundControl since it's not saving state into ViewState.

I understand Dino's BarChart example is not similar to your case since your
control has EditMode. Do you think it's very much like the FormView or
DetailsView (which are also inherited from CompositeDataboundControl). You
might want to take a look at their implementation using Reflector
(http://www.aisto.com/roeder/dotnet/).

Regards,
Walter Wang (wawang@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support

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