title: c# Trackbar increase/decrease
body: <p>I am really new to C# and do have a few problems with the trackbar.
  I am trying to increase/decreasing the volume by adjusting the trackbar up and down. 
  I do have two commands that I can send with a protocol through serial cable, lets that it is "UP" for increased and "DOWN" for decreased volume. after writing "UP", you also write how many times (nn 0-254) you want to increase the volume. e.g. "UP10" will increase the volume by 10. </p>
  
  <p>This is really easy if you have two buttons.</p>
  
  <pre><code>void VolumeDownClick(object sender, EventArgs e)
      {
          try
          {        //writing to serial port
              serialPort.WriteLine("UP10");
          }
          catch
          { 
          }
      }
  </code></pre>
  
  <p>But how would I achieve the same result with a trackbar?
  I have tried to play around with trackbar.Value, but without result. </p>