I know using /// to comment a function is the right way, and it also works for properties as shown by the following code
/// <summary>
/// This is for demo
/// </summary>
public class Foo
{
/// <summary>
/// Description A (working for intellisense)
/// </summary>
public int iA { get; set; }
/// Description B (not working for intellisense)
public int iB { get; set; }
public int iC { get; set; }
}

I am wondering if there is a simpler way to comment class properties for intellisense than the /// which is 3 lines minimum.
It’s just XML. You can do it in one line if you want to.