Setting SubReport Datasource Location

[Dan]

I have been reading threads about setting a subreport's datasource.   I am confused about where to set it programmatically.  Some threads show it being set after the Master report InitialComponent() event.  Some threads show it via the subrpt_NeedDataSource or Subrpt_ItemDatabaBinding within the parent report class file.  Others show it being set in the Subreport's class file in its NeedDataSource or Item Databinding event.

Could someone please tell me where to set the subreport datasource?

[Elian]

Hello Dan,

It can be set in several ways but this depends entirely on your needs. In some cases one approach can provide functionality that the others can't - there is no wrong way, as long as it works correctly.
The recommended way is not to set the SubReport's DataSource from outside but let the SubReport get the data by itself, you only  pass parameters to it so it filters the data accordingly - this approach is demonstrated in our Invoice demo. 
If you use objects (not sqlDataSource) and you have nested collections and one SubReport is repeated many times, then you can set the data-source using Bindings. 
In some cases you can even access the Parent Report object from inside the SubReport to retrieve the data you need. 

All the best,
Elian
the Telerik team