I have an XML that I want to load to objects, manipulate those objects (set values, read values) and then save those XMLs back. It is important for me to have the XML in the structure (xsd) that I created.
One way to do that is to write my own serializer, but is there a built in support for it or open source in C# that I can use?
You can generate serializable C# classes from a schema (xsd) using xsd.exe:
xsd.exe dependency1.xsd dependency2.xsd schema.xsd /out:outputDir
If the schema has dependencies (included/imported schemas), they must all be included on the same command line.