how I do display a loading image while load data from database in wpf?

BackgroundWorker bg = new BackgroundWorker();
bg.DoWork += bg_DoWork;
bg.RunWorkerCompleted += bg_RunWorkerCompleted;

void bg_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
           //hide image show data
}

void bg_DoWork(object sender, DoWorkEventArgs e)
{
            //show image load data
}