C# Access Database not updating without error

Question

I'm trying to polish up an old program I made a few months ago, its essentially a social networking app. As such I'm trying to "write" a new row into one of my tables in Microsoft Access (2010). Before, that was working fine, it was updating as needed/the button pressed. But now, its not.

When I press "Post" it goes through all the lines in the code without issue/error, however the database is not updated. I can't figure out why its not updating, so any assistance is greatly appreciated;

 private void btnPost_Click(object sender, EventArgs e)
    {
        String postText = txtPost.Text;

        String followingIDStr = cboxFollowing.ValueMember.ToString();
        int followingID = Convert.ToInt32(followingIDStr);

        con = new OleDbConnection(connectionString);
        DataSet ds = new DataSet();
        DataRow dRow;
        String sql = "SELECT * FROM Post;";
        OleDbDataAdapter da = new OleDbDataAdapter(sql, con);
        con.Open();
        OleDbCommandBuilder cb = new OleDbCommandBuilder(da);
        DataTable dataTable = new DataTable();
        da.Fill(ds, "Post");

        dRow = ds.Tables["Post"].NewRow();

        dRow[1] = memberID;
        dRow[2] = followingID;
        dRow[3] = "Text";
        dRow[4] = postText;
        dRow[5] = DateTime.Today.Date.ToString();
        dRow[6] = DateTime.Now.ToString("HH:mm");
        dRow[7] = DateTime.Now.ToString("dd/MM/yy HH:mm:ss");

        ds.Tables["Post"].Rows.Add(dRow);
        cb.DataAdapter.Update(ds.Tables["Post"]);

        frmNewsFeed newsFeed = new frmNewsFeed();
        newsFeed.memberID = memberID;
        this.Close();
        newsFeed.Show();
    }