private void txtBarcode_TextChanged(object sender, EventArgs e) { ClearBoxes(); BL.CLS_ORDERS clsPro = new BL.CLS_ORDERS(); DataTable dt = new DataTable(); dt = clsPro.SEARCH_BARCODE(txtBarcode.Text); if (dt.Rows.Count > 0) { txtProductID.Text = dt.Rows[0][0].ToString(); txtProductName.Text = dt.Rows[0][1].ToString(); txtProductPrice.Text = dt.Rows[0][2].ToString(); // txt_ID.SelectionStart = 0; // txt_ID.SelectLenth = txt_ID.textLenth; } }