How can I subtract two generic objects (T - T) in C# (Example: DateTime - DateTime)?

Question

I wrote a Generic Class:

public class Interval where T : IComparable // for checking that Start < End 
{
    public T Start { ge         


        

Answer 1

this work

public object Duration
{
    get
    {
        return (dynamic)End - (dynamic)Start;
    }
}

but no check, and slow