using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace DataExportClass
{
    class Program
    {
        public class Company
        {
            public int ID { get; set; }
            public string NAME { get; set; }
            public string CITY{ get; set; }
        }
        
        static void Main(string[] args)
        {
            var Company= new List<Company>()
            {
                new Company
                {
                    ID  = 111,
                    NAME = "Devesh",
                    CITY = "Ghaziabad"
                },
                new Company
                {
                    ID = 222, 
                    NAME = "ROLI", 
                    CITY = "KANPUR"
                }
            };
            ExportData.ExportCsv(employees, "employees");
        }


        public static class ExportData
        {
            public static void ExportCsv<T>(List<T> genericList, string fileName)
            {
                var sb = new StringBuilder();
                var basePath = AppDomain.CurrentDomain.BaseDirectory;
                var finalPath = Path.Combine(basePath, fileName+".csv");
                var header = "";
                var info = typeof(T).GetProperties();
                if (!File.Exists(finalPath))
                {
                    var file = File.Create(finalPath);
                    file.Close();
                    foreach (var prop in typeof(T).GetProperties())
                    {
                        header += prop.Name + "; ";
                    }
                    header = header.Substring(0, header.Length - 2);
                    sb.AppendLine(header);
                    TextWriter sw = new StreamWriter(finalPath, true);
                    sw.Write(sb.ToString());
                    sw.Close();
                }
                foreach (var obj in genericList)
                {
                    sb = new StringBuilder();
                    var line = "";
                    foreach (var prop in info)
                    {
                        line += prop.GetValue(obj, null) + "; ";
                    }
                    line = line.Substring(0, line.Length - 2);
                    sb.AppendLine(line);
                    TextWriter sw = new StreamWriter(finalPath, true);
                    sw.Write(sb.ToString());
                    sw.Close(); 
                }
            }
        }
    }
}

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