WPF percentage status shown in GridView MVVM

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WPF

C#5.0

Microsoft

PRISM

Hi All Experts,

I got some problem in showing download percentage in GridView of WCF.i used MVVM pattern. here is my background worker in application start.

public partial class MainWindow : Window
   {
       public MainWindow()
       {
           Overall.EverythingOk = "Nothing";

           InitializeComponent();
           //IRepo repo = new Repo();
           ViewModel.MainWindowsViewModel viewModel = new ViewModel.MainWindowsViewModel();
           this.DataContext = viewModel;

           BackGroundThread bgT = new BackGroundThread();
           bgT.bgWrk.RunWorkerAsync();
       }
   }

Here is the DoWork function in BackGroundTHread class

public void bw_DoWork(object sender, DoWorkEventArgs e)
       {
           if (!Overall.stopStatus)
           {
               for (int i=0; i < 10000; i++)
               {
                   Overall.PercentageDwnd = i;
                   Overall.caseRefId = "999999";
                   if (i == 9998)
                   {
                       i = 1;
                   }
               }
           }
       }

Overall.PercentageDwnd and Overall.caseRefId are static variable(you can call from everywhere in the application) and always update until the backgroundworker completed. I got another viewmodel called TestViewModel and here it is.

public class TestViewModel:BindableBase
    {        
        private String _UpdatePer=Overall.PercentageDwnd.ToString();
        public String UpdatePercentage
        {
            get { return _UpdatePer; }
            set { SetProperty(ref _UpdatePer, value); }
        }

        private ObservableCollection<tblTransaction> _ViewAKA = new ObservableCollection<tblTransaction>();
        private tblTransaction model;

        public TestViewModel(tblTransaction model)
        {
            // TODO: Complete member initialization
            
        }
        public ObservableCollection<tblTransaction> ViewAKA
        {
            get { return _ViewAKA; }
            set { SetProperty(ref _ViewAKA, value); }
        }
    }

I bind with TestView.xaml file

<Window x:Class="EmployeeManager.View.TestView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TestView" Height="359.774" Width="542.481">
    <Grid Margin="0,0,2,0">
        <Label Content="{Binding UpdatePercentage,UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left" Background="Red" Foreground="White" Margin="130,86,0,0" VerticalAlignment="Top" Width="132" Height="39">
            
        </Label>

    </Grid>
</Window>

How can i realtime update Percentage in Label? quite newbie in WPF as well as MVVM

THanks
Weeiyourda