loop two related datagridviews

Dear experts

I have 3 tables cbjmain,cbjdetail,rp_link there relations are as under

ds.Relations.Add("relation1", ds.Tables["cbjMain"].Columns["ui"], ds.Tables["cbjDetail"].Columns["cbjMainUI"], false);
ds.Relations.Add("relation2", ds.Tables["cbjDetail"].Columns["ui"], ds.Tables["rp_link"].Columns["link_ui"], false);

bs = new BindingSource(ds, "cbjMain");
bsCbjDtl = new BindingSource(bs, "relation1");
bsRP_link = new BindingSource(bsCbjDtl, "relation2");

foreach (DataGridViewRow dgvrcbjdetail in dgvCbjdetail.Rows)
                {
                    cbjdetailrow = bsCbjDtl[dgvrcbjdetail.Index] as DataRowView;
                    foreach (DataGridViewRow dgRow in dgvBilsLinked.Rows)

can somebody please guide how dgvBilsLinked will records will point as dgvCbjdetail rows iterate.

i am facing problem that foreach (DataGridViewRow dgvrcbjdetail in dgvCbjdetail.Rows) is always poiting to the position of dgvCbjdetail and not respecting its iteration in foreach loop