Vista - tableadapter. Loosing newly added state of child tables

I am trying to update my data using tableadapters. I have table1 and
table2. table2 has a foreignkey reference to table1.I see that table2
has one new row (i = 2) but after table1 update, I read i as 0.

Am I making any mistake here?

int i = this.table2.Select(null, null, DataViewRowState.Added).Length;

table1TableAdapter = new table1TableAdapter();
table1TableAdapter.Update(this.table1);

table2TableAdaptertable2TableAdapter = new table2TableAdapter();
i = this.table2.Select(null, null, DataViewRowState.Added).Length;
table2TableAdapter.Update(this.table2.Select(null, null,
DataViewRowState.Added));