private void cmdUploadExcel_Execute(object obj)
        {
            try
            {
                string fileName     = string.Empty;
                string safeFileName = string.Empty;
                // Initialize an OpenFileDialog
                OpenFileDialog openFileDialog = new OpenFileDialog();

                // Set filter and RestoreDirectory
                openFileDialog.RestoreDirectory = true;
                openFileDialog.Filter           = "Excel documents(*.xlsx)|*.xlsx";

                bool?result = openFileDialog.ShowDialog();
                if (result == true && openFileDialog.FileName.Length > 0)
                {
                    fileName = openFileDialog.FileName;
                }

                if (string.IsNullOrEmpty(fileName) || !File.Exists(fileName))
                {
                    return;
                }
                safeFileName = openFileDialog.SafeFileName;

                TupleOfstringstringboolean objTuple = pxyInvoice.UploadSheetUpdateDelete(IMSLibrary.Class.Helper.ConvertToByte(fileName.ToString()), safeFileName, Global.UserID, Const.InvoicingSheetType);
                ErrorFolder = objTuple.m_Item1;
                ErrorFile   = objTuple.m_Item2;
                if (objTuple.m_Item3)
                {
                    UIHelper.ShowMessage("File uploaded successfully!");
                    btnUpload    = false;
                    btnErrorFile = true;
                    return;
                }
                UIHelper.ShowMessage("File not uploaded!");
            }
            catch (FaultException ex)
            {
                UIHelper.ShowErrorMessage(ex.Message);
            }
        }