我如何使用IComparable接口？

public class CustomComparable : IComparable
{
    public int Value { get; set; }

    public CustomComparable(int value)
    {
        Value = value;
    }

    public int CompareTo(object obj)
    {
        if (obj == null) return 1;

        CustomComparable other = obj as CustomComparable;
        if (other != null)
        {
            return this.Value.CompareTo(other.Value);
        }
        else
        {
            throw new ArgumentException("Object is not a CustomComparable");
        }
    }
}

List<CustomComparable> list = new List<CustomComparable>();
list.Add(new CustomComparable(5));
list.Add(new CustomComparable(3));
list.Add(new CustomComparable(7));

list.Sort();