[Solved] How to create an object C#

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You should separate your classes and use the nested classes as property types. 

namespace WindowsFormsApp
{
    class Car
    {
        public Id Id { get; set; }
        public Tires Tires { get; set; }
    }

    public class Id
    {
        public string brand { get; set; }
        public string model { get; set; }
        public int year { get; set; }
        public string r_no { get; set; }
        public string owner { get; set; }
    }

    public class Tires
    {
        public string front_value_mm { get; set; }
        public string back_value_mm { get; set; }
        public bool front_back { get; set; }
    }
}

Now you can new-up a car class with the nested values.

var car = new Car
{
    Id = new Id 
    {
        brand = "Honda",
        model = "Civic",
        year = 2017,
        r_no = "r_no",
        owner = "owner"
    },

    Tires = new Tires
    {
        front_value_mm = "front_value_mm",
        back_value_mm = "back_value_mm",
        front_back = true
    }
}

You should then be able to access the nested properties like this.

var brand = Car.Id.brand // Honda

If you want to assign values using parameters you need a constructor method.

solved How to create an object C#