How to refresh XSD file when change in query

Selecting "Configure" in the dataset designer.
Then in the TableAdapter configuration wizard, in select query it'll show changed columns added or deleted.
After clicking "Finish", the data tables are re-generated and refreshed.

I've checked it in VS2010.

How to refresh Tablix dataset in rdlc report

Just follow these steps

1. Open the report
2. Click menu item 'View', then 'Report Data'
3. Right click the report dataset, then select 'Refresh'

you can find more details here.