Serialization of two Dictionaries at once

Question

I have two classes as below and I\'m using them in two separate Dictionaries. How can I Serialize these two Dictionaries to a single file? my Serializa

Answer 1

Create a class marked with the Serializable attribute, containing instances of these two dictionaries:

[Serializable]
public class Building
{
    public static Building Instance = new Building();

    public readonly Dictionary Beams = new Dictionary();
    public readonly Dictionary Columns = new Dictionary();

    public static Dictionary AllBeams
    {
        get { return Instance.Beams; }
    }
}

EDIT
A Singleton pattern used to avoid the exception.
In the other parts of the code use Building.Instance to access the dictionaries.
EDIT2
A static property introduced: Building.AllBeams. You can use it as shorthand.