Parallel Processing

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

namespace ParallelClass
{
    public abstract class ReportCalculations
    {
        private readonly List<CompanyInfo> _totals = new List<CompanyInfo>();
        private long _elapsedTime;

        public long Elapsed_ms
        {
            get { return _elapsedTime; }
        }


        public void Begin(IEnumerable<IGrouping<int, IGrouping<int, CompanyInfo>>> companyGroups)
        {
            var sw = new Stopwatch();
            sw.Start();

            StartCalculations(companyGroups);

            sw.Stop();
            _elapsedTime = sw.ElapsedMilliseconds;
        }

        public virtual string Name
        {
            get { return "Generic Report Class"; }
        }

        public virtual void StartCalculations(IEnumerable<IGrouping<int, IGrouping<int, CompanyInfo>>> companyGroups)
        {
            
        }
    }
}