Export List of Objects to a Comma-Separated Values (.CSV) file using C#, allowing the export of Entity Framework DbSet to CSV File. An example of use comes within the code.

DataExportClass.cs

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

namespace DataExportClass
{
    class Program
    {
        public class Employee
        {
            public string Name { get; set; }
            public string Cpf { get; set; }
        }
        
        static void Main(string[] args)
        {
            var employees = new List<Employee>()
            {
                new Employee
                {
                    Cpf = "1234",
                    Name = "Luis Felipe"
                },
                new Employee
                {
                    Cpf = "5678",
                    Name = "Matheus Guedes"
                }
            };
            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(); 
                }
            }
        }
    }
}

Thank you very much for this good information and example.

thanks, clear and good!
but to separate into columns, need to use "," and not ";"
header += prop.Name + ", ";
line += prop.GetValue(obj, null) + ", ";

It Works fine! thank you