How to use Controller class with data provider class in SSRS report

Hello All,

I have one standard report used of controller class  query based report used  of Print management for multiple report print.

I need to add some business logic  to add some extra field in that report ,so I have added one DP classes and add our logic to retrieve the particular field.

Now report is opening but after clicking ok in dialog page  its throwing data set error.

Could you please suggest we can proceed with controller class and DP class ?

Please suggest  your suggestion.

Regards

Deepak