An Easy Way to Calculate Duration in C#

For a project I'm currently working on, I needed to find a simple way to calculate the duration between two button presses. I considered using the stopwatch, or timer class, but I discovered a (in my opinion) better solution.

public void OnStart()
{
    this.Start = DateTime.Now;
}

public void OnEnd()
{
    this.End = DateTime.Now;
}

public TimeSpan GetDuration()
{
    return this.End - this.Start;
}

The timespan is able to hold the difference between two datetimes despite the format, which is really cool.