How to add 2 Time Selector

With the Substract() method you get the difference of 2 TimeSelector , now I would like to know how to find the sum.

if the difference is like this:

Dim diferencia As TimeSpan = horaFin.Subtract(horaInicio)

What I'm looking for is to add the two values, something like for example:

Dim suma As TimeSpan = horaInicio + horaFin