>I've been trying to find how to do that with the Properties window on the right and no wonder why I didn't find it. So, am I understanding correclty that we cannot add a property such as we do in VFP by using the visual interface?

Nope. You have to code it. Welcome to this brave new world! 8-)

Indeed, you better try to understand the difference between properties and member classes. In .NET, a property is the way to access a member class, not the member class itself.

Do inside Cathi's code:

public int Width  // This is the member class (or field)
{
   // The get/set code here is what constitutes the "Property"
   get { return width; }
   set
   {
      if (value > 0)
         width = value;
      else
         throw new ArgumentOutOfRangeException("Width must be 1 or higher");
   }
}

Of course Cathi or anyone else here can correct and enhance my explanation. But this actually how things are. VFP makes all of this invisible to us.

Best luck!