deleting row from table

hi alll
i have
*******dataset**********
dscompanies 1

*********tables in the dataset**********
a) res
b) T_Companies

both conncted with 1:m relation T_resT_companies (1 company can have many records in res)

*********datagrid***************
grdConnWay
datasource = T_companies.defaultview
datamember = T_Companies.T_resT_companies



so when i sand on companies grid (not mentioned here) its retrives all the res details.

my question is when i stand on grdConnWay - and want to delete row i should delete it from the res table - how do i do that?
or how i retrieve the key value?
i hope i clarify myself as well...
thanks to all

Private Sub cmd_DeleteRow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmd_DeleteRow.Click

'Delete a Row and commit the changes to the Dataset
Dim strFilter As String = CType(Me.TextBox1.Text, Int32)
Dim oTempRow As DataRow = oDS.Tables("DATA").Rows.Find(strFilter)

If Not IsNothing(oDS) And Not IsNothing(oTempRow) Then
oDS.Tables("DATA").Rows.Remove(oTempRow)
End If
oDS.AcceptChanges()

End Sub

requires Index on the Datatable


after that delete the related rows in the child record


Another approach is to create relationships between 2 tables and set referentioal integrity on Delete