C#: Finding the Number of Days Between Two DateTime Items

One very common requirement is for the number of days elapsed since a particular Date and Time. In C# this can be accomplished through the use of the TimeSpan class.

The easiest way to create a TimeSpan is like this:

TimeSpan tsMySpan = DateTime.Now.Subtract( dtCompareTime );

// The number of days elapsed can be accessed like this:
// tsMySpan.Days