ISDataSource has already provided a property to define the select function you could use. For this scenario, you could create a new function to select the data from both the SQL Server and Oracle Database and assign it as the select method in the ISDataSource.

Thanks for your quick response.

 Can you please give me the code

Thanks in advance.

We do not have the code for such scenario. However the concept should be similar with BindtoCustomObject.aspx which required you to defined the select method in the ISDataSource. The select method definition, GetCustomers, could be viewed on CustomerDataAccess.cs under AppCode >> GenericObject