Note: When a method call is bound to a method through reflection using Binder.BindToMethod(BindingFlags, MethodBase[], Object[]@, ParameterModifier[], System.Globalization.CultureInfo, String[], Object@) , the order, value, and type of the parameters in the original method call can be changed to match the signature of the bound method. The binder creates state as an opaque object that records the original order of the argument array. If, on return from Binder.BindToMethod(BindingFlags, MethodBase[], Object[]@, ParameterModifier[], System.Globalization.CultureInfo, String[], Object@), state is not null, the system calls Binder.ReorderArgumentArray(Object[]@, object). This allows a caller to map the argument array of a method back to the original form if the order had been altered by Binder.BindToMethod(BindingFlags, MethodBase[], Object[]@, ParameterModifier[], System.Globalization.CultureInfo, String[], Object@) . This is useful if ByRef arguments are in the argument array, because the caller can retrieve those arguments in their original order on return from this method. When arguments are passed by name (i.e., using named arguments), the binder reorders the argument array and that is what the caller sees. This method insures that the original order of the arguments is restored.