I know this is almost a year old, but I have found a much easier way to achieve this, so I thought I would share:
Dim actionsArray() As Action =
new Action(){
New Action(Sub() DoComputation1()),
New Action(Sub() DoComputation2()),
...
New Action(Sub() DoComputation100())
}
System.Threading.Tasks.Parallel.Invoke(New Tasks.ParallelOptions() With {.MaxDegreeOfParallelism = 5}, actionsArray)
Voila!