naidelih says: Hello World!!!

For the ff example, creating 1 datatable, 3 columns then adding a row to the table

            Dim mDS As New DataSet

            Dim mDT As New DataTable

            'Adding table to dataset

            mDS.Tables.Add(mDT)

        [...]

You can add multiple relations to a dataset.
Ex
Parenttable
ParentID1
ParentID2
……
ChildTable
ChildID1
ChildID2
…..

mDS1.Relations.Add("relationname", New DataColumn()_

{mDS1.Tables("ParentTable").Columns("ParentID1"), _

mDS1.Tables("ParentTable").Columns("ParentID2")}, _

New DataColumn() {mDS1.Tables("ChildTable").Columns("ChildID1"), _

mDS1.Tables("ChildTable").Columns("ChildID2")}, False)