name,value
name,value
etc.

a,5

Car.a = 5;

private void AssignProperty(object obj, string propertyName, string propertyValue)
{
    PropertyInfo property = obj.GetType().GetProperty(propertyName);
    property.SetValue(obj, Convert.ChangeType(propertyValue, property.PropertyType), null);
}

public class StringLinesDeserializer<T> where T : new()
{
    public T Deserialize(string[] assignments)
    {
        T result = new T();

        foreach (string assignment in assignments)
        {
            int commaPos = assignment.IndexOf(',');
            string propertyName = assignment.Substring(0, commaPos);
            string propertyValue = assignment.Substring(commaPos + 1);

            AssignProperty(result, propertyName, propertyValue);
        }

        return result;
    }

    private void AssignProperty(object obj, string propertyName, string propertyValue)
    {
        PropertyInfo property = obj.GetType().GetProperty(propertyName);
        property.SetValue(obj, Convert.ChangeType(propertyValue, property.PropertyType), null);
    }
}

string[] assignments = new string[]{"a,5","b,6"};
StringLinesDeserializer<Car> deserializer = new StringLinesDeserializer<Car>();
Car newCar = deserializer.Deserialize(assignments);

Car car = new Car { a = 10, name = "Golf" };
var str = JsonConvert.SerializeObject(car);

{"a":10,"name":"Golf"}

Car deserializedCar = JsonConvert.DeserializeObject<Car>(str);

var car = new Car { name = "Hellcat", a = 10 };
var serializer = new System.Xml.Serialization.XmlSerializer(typeof(Car));
string carXml = null;
using (var ms = new System.IO.MemoryStream())
{
    serializer.Serialize(ms, car);
    carXml = System.Text.Encoding.UTF8.GetString(ms.ToArray());
}

<?xml version="1.0"?>
<Car xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <a>10</a>
  <name>Hellcat</name>
</Car>

public class Car
{
    public object a { get; set; }
    public object b { get; set; }
}

private Car GetCarFromFile(string strFilePath)
{
    var lstCarFile = System.IO.File.ReadAllLines(strFilePath);

    var car = new Car();
    foreach (var c in lstCarFile)
    {
        var name = c.Split(',')[0].Trim();
        var value = c.Split(',')[1].Trim();

        car.GetType().GetProperty(name).SetValue(car, value, null);
    }

    return car;
}

var car = GetCarFromFile("D:/CarMembersValue.txt");