Recently, I'm working on serialization with C#.
I found that the automatic-properties' fields are named "<...>k_BackingField".
So my problem is dose this naming rule same in all .Net versions, and it won't change in any situations?
It's an internal implementation that may change between the different versions of the C# compiler.
The different serialization mechanisms provided by the libraries have different compatibility rules. For instance, I do not believe that binary serialization is guaranteed to work between different versions of the framework.