speedcontrol solution

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Globalization;

namespace control
{
    class control
    {
        static List<string> vehicledata = new List<string>();
        static int sectionlength = 10;

        static List<string> readinput(string filename)
        {
            List<string> vdata = new List<string>(File.ReadAllLines(filename));
            return vdata;
        }

        static int TrafficCount()
        {
            int traffcount = vehicledata.Count;
            int db = 0;
            for (int i = traffcount-1; i >=0; i--)
            {
                if (vehicledata[i].Split(' ')[5] == "9")
                {
                    db++;
                }
            }
            return traffcount - db;
        }

        static int PassStartingPoint(int hour, int minute)
        {
            int db = 0;
            for (int i = 0; i < vehicledata.Count; i++)
            {
                if (Convert.ToInt32(vehicledata[i].Split(' ')[1]) == hour && Convert.ToInt32(vehicledata[i].Split(' ')[2]) == minute)
                {
                    db++;
                }
            }
            return db;
        }

        static double AverageSpeed(DateTime time, int distance)
        {
            double t = (time.Hour * 3600 + time.Minute * 60 + time.Second + (double)time.Millisecond / 1000);
            return ((double)distance*1000 / t)*3.6;
        }

        static DateTime ElapsedTime(int n)
        {
            return new DateTime() + TimestringToDateTime(vehicledata[n], 1).Subtract(TimestringToDateTime(vehicledata[n], 0));
        }

        static double TrafficIntensity(string hourminute)
        {
            int db = 0;
            for (int i = 0; i < vehicledata.Count; i++)
            {
                int entrysecond = Convert.ToInt32(vehicledata[i].Split(' ')[1]) * 3600 + Convert.ToInt32(vehicledata[i].Split(' ')[2])*60;
                int exitsecond = Convert.ToInt32(vehicledata[i].Split(' ')[5]) * 3600 + Convert.ToInt32(vehicledata[i].Split(' ')[6])*60;
                int enteredtime = Convert.ToInt32(hourminute.Split(' ')[0]) * 3600 + Convert.ToInt32(hourminute.Split(' ')[1])*60;
                if (entrysecond<=enteredtime && enteredtime<=exitsecond)
                {
                    db++;
                }
            }
            return (double)db/ 10;
        }

        static DateTime TimestringToDateTime(string datarow, int which)
        {
            int i = 0;
            if (which == 1) i = 4;
            string timestring = datarow.Split(' ')[i+1] + ":" +
                         datarow.Split(' ')[i+2] + ":" +
                         datarow.Split(' ')[i+3] + "." +
                         datarow.Split(' ')[i+4];
            DateTime time = Convert.ToDateTime(timestring);
            return time;
        }

        static int MaxSpeed()
        {
            int max = 0;
            double maxvalue = AverageSpeed(ElapsedTime(max), sectionlength);
            for (int i = 1; i < vehicledata.Count; i++)
            {
                if (maxvalue < AverageSpeed(ElapsedTime(i), sectionlength))
                {
                    max = i;
                    maxvalue = AverageSpeed(ElapsedTime(max), sectionlength);
                }
            }
            return max;
        }

        static int Overtakes(int n)
        {
            int overtakes = 0;
            for (int i = n - 1; i >= 0; i--)
            {
                if (TimestringToDateTime(vehicledata[n], 1) <= TimestringToDateTime(vehicledata[i], 1))
                {
                    overtakes++;
                }
            }
            return overtakes;
        }

        static double SpeedingPercent()
        {
            int db = 0;
            for (int i = 0; i < vehicledata.Count; i++)
            {
                if (90 < AverageSpeed(ElapsedTime(i), sectionlength))
                {
                    db++;
                }
            }
            return (double)db / vehicledata.Count;
        }
        static int FineValue(double speed)
        {
            int fine = 0;
            if (speed >= 104 && speed < 121) fine = 30000;
            if (speed >= 121 && speed < 136) fine = 45000;
            if (speed >= 136 && speed < 151) fine = 60000;
            if (speed >= 151) fine = 200000;
            return fine;
        }


        static void Main(string[] args)
        {
            // Exercise 1.
            vehicledata = readinput("measurements.txt");

            //Exercise 2.
            Console.WriteLine("Exercise 2.");
            Console.WriteLine("The data of {0} vehicles were recorded in the measurement.", vehicledata.Count);
            Console.WriteLine();

            //Exercise 3.
            Console.WriteLine("Exercise 3.");
            Console.WriteLine("Before 9 o'clock {0} vehicles passed the exit point recorder.", TrafficCount());
            Console.WriteLine();

            //Exercise 4.
            Console.WriteLine("Exercise 4.");
            Console.Write("Enter an hour and minute value: ");
            string hourminute = Console.ReadLine();
            int hour = Convert.ToInt32(hourminute.Split(' ')[0]);
            int minute = Convert.ToInt32(hourminute.Split(' ')[1]);
            int passeddb = PassStartingPoint(hour, minute);
            Console.WriteLine("\ta. The number of vehicle that passed the entry point recorder: {0} ", passeddb.ToString());
            Console.WriteLine("\tb. The traffic intensity: {0}", TrafficIntensity(hourminute).ToString("F1"));
            Console.WriteLine();

            //Exercise 5.
            Console.WriteLine("Exercise 5.");
            int max = MaxSpeed();
            double maxv = AverageSpeed(ElapsedTime(max), sectionlength);
            int overtakedb = Overtakes(max);
            Console.WriteLine("The data of the vehicle with the highest speed are \r\n" +
                                  "\tlicense plate number: {0} \r\n" +
                                  "\taverage speed: {1} km/h \r\n" +
                                  "\tnumber of overtaken vehicles: {2}", vehicledata[max].Split(' ')[0], ((int)maxv).ToString(), overtakedb.ToString());
            Console.WriteLine();

            //Exercise 6.
            Console.WriteLine("Exercise 6.");
            Console.WriteLine("{0} percent of the vehicles were speeding.", SpeedingPercent().ToString("P"));
            Console.WriteLine();

            //Exercise 7.
            FileStream fs = new FileStream("fines.txt", FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            for (int i = 0; i < vehicledata.Count; i++)
            {
                double v = AverageSpeed(ElapsedTime(i), sectionlength);
                if (104 <= v)
                {
                    sw.WriteLine("{0}\t{1} km/h\t{2} Ft", vehicledata[i].Split(' ')[0], ((int)v).ToString(), FineValue(v));
                }
             }
            sw.Close();
            fs.Close();

            Console.WriteLine("The file is ready.");
            Console.ReadLine();
        }
    }
}