Save/Load sessions C# (other than DB and XML)

How can I save/load sessions in an efficient way? I did one project before using SQlite and I faced the database problems. Now, I have another project, but I don't want to use it. XML is an alternative, but I'm not sure if it is the efficient way. Could u tell me what is the best method?

BTW, I want to save many things, like array (could be 3D arrays or more) that are objects, double, big Text Files...