How to define a class whose properties change in runtime? [duplicate]

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I have a class called Attributes

public class Attributes
{
    public string Length { get; set; }
    public string Size { get; set; }
    public string Color { get; set; }
    public string Material { get; set; }
    public string Diameter { get; set; }
}

This class is populated from a call to a web service that returns JSON. The web service returns a different set of attributes each time and it is not possible to define all the attributes at compile time as this could run into thousands.

What is the best way to model such a class in c#?