private void btnViewStock_Click(object sender, EventArgs e)
        {
            frmStockReport obj = frmStockReport.getInstance();

            obj.Show();
            obj.BringToFront();
        }
 public static frmStockReport getInstance()
 {
     if (instance == null || instance.IsDisposed)
     {
         instance = new frmStockReport();
     }
     return(instance);
 }