I'm not sure what you mean, but...
DataSource[
^] property of
DataGridView[
^] (DGV) accepts
DataTable[
^] object. It means you can fetch data from different tables in one query:
SELECT t1.*, t2.*
FROM t1 INNER JOIN t2 ON t1.key = t2.key
But if you use
GridView[
^] (ASP.NET) and want to display related records on another GV, please read about
nested gridview[
^].