Hello dufour01 ,

Thank you for the sample code.

Using it I was able to reproduce the behavior. The issue happens because you are initializing the hierarchical data source too late in PageLoad event handler.

I recommend you using Init event handler of WebHierarchicalDataSource for the purpose.

I am attaching a sample code using NorthWind database which I have not included in order to reduce the size of the file.

Please let me know if you have further questions.

Tried without my linq query, same problem.

 WebHierarchicalDataSource1.DataViews.FindByID("TableA").DataSource = Data.Tables["TableA"];
            WebHierarchicalDataSource1.DataViews.FindByID("TableB").DataSource = Data.Tables["TableB"];

No problem with the sample for me

I just upgraded to lattest version with latest patch. Same problem.

I attached an test.

display of webpage is good, but export duplicate child bands.

Totest : 2 tables to create :

TableA and TableB  with Fields A1, A2 and fields B1,B2

B1 is a foreign key to A1