title: improve performance of method using Asyc and await
body: <pre><code>public void Calc()
  {
      Method1(true); //Qty*rate 
      Method2(true); //perform another work
      this.Save();
      if (this.Session.InTransaction)         
          this.Session.CommitTransaction();
  }
  </code></pre>
  
  <p>I want improve performance using Async and Await</p>