Lets say we want to use reflection to generate a mock test case for this following Nested Class ClientAddress. When we load an assembly from a disk dynamically, we can use GetType to look up a type defined in the assembly. Example: Assembly assembly = Assembly.GetAssembly(typeof... Type type = assembly.GetType("ConsoleAp... object obj = Activator.CreateInstance(ty... But one point to remember here, to get Assembly.GeType working with nested classes a Plus(+) sign ......