using System;

using System.Text.Json;

using System.Text.Json.Serialization;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        string[] csvData = {

            "lname;fname",

            "jens;larsen",

            "lars;jensen"

        };

        string[] headers = csvData[0].Split(';');

        int colCount = headers.Length;

        for (int i = 1; i < csvData.Length; i++) {

            string[] row = csvData[i].Split(';');

            Person p = new Person();

            for (int j = 0; j < colCount; j++) {

                PropertyInfo prop = p.GetType().GetProperty(headers[j], BindingFlags.Public | BindingFlags.Instance);

                prop.SetValue(p, row[j], null);

            }

        }

    }

}

​

public class Person

{

    public string fname {get;set;}

    public string lname {get;set;}

}