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I have an Action function inside of a Controller, which is being called with AJAX. That Action is taking in 1 parameter. Client side, I construct a JSON object which should serialize into that 1 parameter. The problem I ran into is that the parameter class is declared as abstract. Thus, it cannot be instantiated. When AJAX hits that Action, I get the following: Cannot create an abstract class. Stack Trace: [MissingMethodException: Cannot create an abstract class.] System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache) +98 System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241 System.Activator.CreateInstance(Type type, Boolean nonPublic) +69 ............... Is there any way to pull off such a scenario without creating a different parameter object, "un-declaring" the parameter object as abstract, or digging into mechanics of MVC? Update I'm currently working with back-end developers to tweak their objects. Either way, I think that would be the ultimate solution. Thank you all for your answers.

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