Sum of TimeSpans in C#

Question

I have a collection of objects that include a TimeSpan variable:

MyObject
{ 
    TimeSpan TheDuration { get; set; }
}

I want to use LINQ to

Answer 1

I put this in a class to add an extension method to a collection of timespans:

public static class Extensions:
{
    public static TimeSpan TotalTime(this IEnumerable TheCollection)
    {
        int i = 0;
        int TotalSeconds = 0;

        var ArrayDuration = TheCollection.ToArray();

        for (i = 0; i < ArrayDuration.Length; i++)
        {
            TotalSeconds = (int)(ArrayDuration[i].TotalSeconds) + TotalSeconds;
        }

        return TimeSpan.FromSeconds(TotalSeconds);
    }
}

So now, I can write TotalDuration = (my LINQ query that returns a collection of timespan).TotalTime();

Voila!