Adding rows to a bound datagridview in C#

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C#

C#4.0

Hi do anyone have an idea about adding new rows to datagridview on clicking add button. provided the DGV is already databound and it contains data and the new empty row to be added should display below the last row.

dgv.DataBindings.Clear();
                dgv.AllowUserToAddRows = true;
                int n = dgv.Rows.Add();
                dgv.Rows[n].Cells["col1;].Value = iaccountID;
                dgv.Rows[n].Cells["col2"].Value = iprojectID;
                dgv.Rows[n].Cells["col3"].Value = DBNull.Value;
                dgv.ClearSelection();
                dgv.CurrentCell = dgv.Rows[n].Cells["col1"];
                dgv.BeginEdit(true);

This is wat I've done so far, by default the AllowUsersToAddRows property is set to false.

When clicking add button I'm setting AllowUsersToAddRow property to true

Thanks in Advance