how to make custom struct C#

    struct Parts
    {
        public static Parts NewPart(string PartName, string strName, int PartId)
        {
            return new Parts
            {
                Part = PartName,
                Name = strName,
                Id = PartId
            };
        }
        public string Part { get; set; }
        public string Name { get; set; }
        public string Id { get; set; }
    }

public struct Coords
{
    public Coords(double x, double y)
    {
        X = x;
        Y = y;
    }

    public double X { get; }
    public double Y { get; }

    public override string ToString() => $"({X}, {Y})";
}