Partial Types indicates that other parts of the class, struct or interface can be defined in different files or namespaces. All the parts will be formed to the final type at compile time.
Partial type? working on large projects, multiple programmers work on one class. working with automatically generated source, code can be added to the class without modifying the source file.
Implementation Each of the partial parts of the code must have the same access modifier if a part of code is declared as abstract and others are declared as public => the entire code is considered abstract. Same as sealed class. https://gist.github.com/2592542
Implementation (cont.) Partial Class https://gist.github.com/2592720
Nullable types? Before C# 2.0, only reference type could be null
Nullable types Null values can be defined for the value types. instance of the System.Nullable<T> struct.
Implementation Nullable types have two properties: HasValue Value can also use the == and != operators if (x != null) y = x; https://gist.github.com/2592834
Implementation (cont.) Nullable types in Expression https://gist.github.com/2592857
?? Operator assign a nullable type to a non-nullable type. https://gist.github.com/2592875