private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            try
            {
                var fileName = Properties.Settings.Default.SourceFileName;

                ManageTeam manageTeam = new ManageTeam(fileName);
                if (manageTeam.IsValidFormat)
                {
                    if (manageTeam.IsValidData)
                    {
                        dgFootballGrid.ItemsSource = manageTeam.FootBallTeamList;
                        FootBallTeam footBallTeam = manageTeam.GetTeamWithMinDiff();
                        txtDiff.Text = "'" + footBallTeam.Name + "' with '" + footBallTeam.Diff + "' goal/s";
                    }
                    else
                    {
                        SetError("No Data found");
                    }
                }
                else
                {
                    SetError("Invalid data format.");
                }
            }
            catch (Exception ex)
            {
                SetError(ex.Message);
                MessageBox.Show(ex.Message, "Exception", MessageBoxButton.OK, MessageBoxImage.Exclamation);
            }
        }
        /// <summary>
        /// Initialise Manager Team class and load data file.
        /// </summary>
        /// <param name="fileName"></param>
        public ManageTeam(string fileName)
        {
            string[]     rawText      = System.IO.File.ReadAllLines(fileName);
            string[]     dataColoumns = null;
            FootBallTeam footBallTeam;

            FootBallTeamList = new List <FootBallTeam>();
            int iIndex = 0;

            foreach (var rowItem in rawText)
            {
                dataColoumns = rowItem.Split(new Char[] { '\t', ' ' }, System.StringSplitOptions.RemoveEmptyEntries);
                if (iIndex == 0)
                {
                    iIndex++;
                    if (dataColoumns.Length != 9)
                    {
                        this.IsValidFormat = false;
                        break; // invalid format
                    }
                    this.IsValidFormat = true;
                }
                else
                {
                    if (dataColoumns.Length != 10)
                    {
                        continue;                            //Skip Invalid Rows
                    }
                    footBallTeam = new FootBallTeam
                    {
                        Number  = dataColoumns[0],
                        Name    = dataColoumns[1],
                        P       = Convert.ToInt32(dataColoumns[2]),
                        W       = Convert.ToInt32(dataColoumns[3]),
                        L       = Convert.ToInt32(dataColoumns[4]),
                        D       = Convert.ToInt32(dataColoumns[5]),
                        For     = Convert.ToInt32(dataColoumns[6]),
                        Dash    = dataColoumns[7],
                        Against = Convert.ToInt32(dataColoumns[8]),
                        Points  = Convert.ToInt32(dataColoumns[9])
                    };
                    FootBallTeamList.Add(footBallTeam);
                }
            }
            if (FootBallTeamList.Count > 0)
            {
                this.IsValidData = true;
            }
        }