A c# class that represents a date range data structure.

DateRange.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace Dates
{
	/// <summary>
	///     Represents a range of dates.
	/// </summary>
	public struct DateRange
	{
		/// <summary>
		///     Initializes a new instance of the <see cref="DateRange" /> structure to the specified start and end date.
		/// </summary>
		/// <param name="startDate">A string that contains that first date in the date range.</param>
		/// <param name="endDate">A string that contains the last date in the date range.</param>
		/// <exception cref="System.ArgumentNullException">
		///		endDate or startDate are <c>null</c>.
		/// </exception>
		/// <exception cref="System.FormatException">
		///     endDate or startDate do not contain a vaild string representation of a date and time.
		/// </exception>
		/// <exception cref="System.ArgumentException">
		///		endDate is not greater than or equal to startDate
		/// </exception>
		public DateRange( string startDate, string endDate ) : this()
		{
			if ( string.IsNullOrWhiteSpace( startDate ) )
			{
				throw new ArgumentNullException( "startDate" );
			}

			if ( string.IsNullOrWhiteSpace( endDate ) )
			{
				throw new ArgumentNullException( "endDate" );
			}

			Start = DateTime.Parse( startDate );
			End = DateTime.Parse( endDate );

			if ( End < Start )
			{
				throw new ArgumentException( "endDate must be greater than or equal to startDate" );
			}
		}

		/// <summary>
		///     Gets the start date component of the date range.
		/// </summary>
		public DateTime Start { get; private set; }


		/// <summary>
		///     Gets the end date component of the date range.
		/// </summary>
		public DateTime End { get; private set; }

		/// <summary>
		///     Gets a collection of the dates in the date range.
		/// </summary>
		public IList<DateTime> Dates
		{
			get
			{
				var startDate = Start;

				return Enumerable.Range( 0, Days )
					.Select( offset => startDate.AddDays( offset ) )
					.ToList();
			}
		}

		/// <summary>
		///     Gets the number of whole days in the date range.
		/// </summary>
		public int Days
		{
			get { return ( End - Start ).Days + 1; }
		}
	}
}

thanks