private void LoadAddiction(string patID) { _addictions = Addiction.ListAddiction(patID); tr = new DataTable(); // create and execute query tr.Columns.Add("id"); //2 tr.Columns.Add("Name"); //2 tr.Columns.Add("Description"); // tr.Columns.Add("Created"); // tr.Columns.Add("Delete"); // foreach (Addiction r in _addictions) { tr.Rows.Add(new object[] { r.Id, r.Name, r.Description, r.Created, "Delete" }); } dtAddict.DataSource = tr; dtAddict.AllowUserToAddRows = false; dtAddict.Columns[0].Visible = false; dtAddict.Columns[4].DefaultCellStyle.BackColor = Color.Aquamarine; }