Unable to set Row.Readonly=false with databound DataGridView

Question

I have a dataGridView that is bound to a tableAdaptor, behind this table is a MS SQL server database.

In Form1_Load i have dataGridView1.ReadOnly = true; and in the dataGridView1 controls on the form i have Enable Editing selected.

I then fill the dataGridView at run time here: stockTableAdapter.Fill(sIMSDataSet.Stock);

What i am trying to do, is have a user select any cell within a row and click a button which then allows the user to edit that row.

I have tried various ways to get the row the user currently has selected to be set to ReadOnly=flase but i can't get it to work.

This is what i have tried:

  private void button7_Click_1(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentRow.ReadOnly == true)
            {
                dataGridView1.CurrentRow.ReadOnly = false;
                dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
            }
        }

And i have also tried the answer is this question:

unable to set Row.Readonly=false in Datagridview in winforms

The user suggests in his testing he was not able to set the row to ReadOnly=flase on databound dataGridViews. But seeing as the answer is now 6 years old i was hoping there was a way to do it now.