Car.cs
 

using System;

namespace MyApplication
{
  class Car
  {
    public string model;

    // Create a class constructor with a parameter
    public Car(string modelName)
    {
      model = modelName;
    }

    static void Main(string[] args)
    {
      Car Ford = new Car("Mustang");
      Console.WriteLine(Ford.model);
    }
  }
}

Result:
Mustang