Anonymous types are a feature of C# 3.0, Visual Basic .NET 9.0, Oxygene, Scala and Go that allows data types to encapsulate a set of properties into a single object without having to first explicitly define a type.
The properties created are read-only in C#, however, they are read-write in VB.net.
This feature should not be confused with dynamic typing.
While anonymous types allow programmers to define fields seemingly "on the fly," they are still static entities.
Type checking is done at compile time, and attempting to access a nonexistent field will cause a compiler error.