Access SSRS Report DataSet after binding ...

Is there is any way I can access ReportViewer DataSet after it being filled?

There is no DataBound Event (after binding data) in ReportViewer so I can access the data.

What I'm Trying to achieve is :

1- access data before it's submitted to the report ... 
2- Get for example:dataset.Tables(0).Rows(0).Item("Price")
3- Do Some Operation on it : Dim newPrice = DoSomething(Price)
4- assign newPrice data to a Report Parameter.
5- assign Parameter Value to a specific Textbox inside the Report.

Thanks.