struggling with objects and methods

class Circle
{
    float radius;
    int id;
    int nextID;

    static void initCircle()
    {
        Console.WriteLine("Enter the radius of your circle.");
        radius = float.Parse(Console.ReadLine());
    }
    initCircle();

}

class Circle
{
    float radius;
    int id;
    int nextID;

    static void initCircle()
    {
        Console.WriteLine("Enter the radius of your circle.");
        radius = float.Parse(Console.ReadLine());
    }
    initCircle();

}