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How to add a child entity collection to an entity on its creation using datagridview selected rows
dgvTags.DataSource = _rs.Tags.Where(x => x.TagGroup.Name == "All Reasons").OrderBy(x => x.Name);

Line l = new Line
{
    Part = o.Part,
    Description = desc,
    Price = o.Price.Value,
    InvoiceNo = o.InvoiceNo,
    Cost = o.Cost.Value,
    Comments = txtComment.Text,
    Tags = dgvTags.SelectedRows as List<Tag> // <--- needs work here
                    };

foreach (DataGridViewRow r in dgvTags.SelectedRows)
{
    l.Tags.Add(r.DataBoundItem as Tag);
}

IList<Tag> myrows = dataGridView1.SelectedRows.Cast<DataGridViewRow>().Select(x => x.DataBoundItem as Tag).ToList();

Tags = new System.Data.Objects.DataClasses.EntityCollection<RS.Tag>(
    dataGridView1.SelectedRows.Cast<DataGridViewRow>()
    .Select(x => x.DataBoundItem as Tab).ToList());

dataGridView1.SelectedRows.Cast<DataGridViewRow>()
    .Select(x => x.DataBoundItem as Tab).ToList().ForEach(y => Tags.Add(y));

foreach (DataGridViewRow r in dgvTags.SelectedRows)
{
    l.Tags.Add(r.DataBoundItem as Tag);
}