private void txtBarCodeID_TextChanged(object sender, EventArgs e) { string strBarCode = txtBarCodeID.Text.Trim(); if (strBarCode.Length == barCodeType - 1) { if (BarCodeHelper.IsBarCodeValid("0" + strBarCode)) { strBarCode = "0" + strBarCode; txtBarCodeID.Text = strBarCode; return; } } //Neu ma lay ve la 8 hoac 13 so thi thuc hien if (strBarCode.Length == barCodeType) { txtBarCodeID.Focus(); if (barCodeType == 8) { strBarCode = "00000" + strBarCode; } LoadEmployee(strBarCode); } }