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A definition of a delegate, event, or operator declares an Optional (Visual Basic) parameter.
Optional parameters are allowed only on Declare, Function, Property, and Sub parameters.
Error ID: BC33010
To correct this error
Remove the Optional keyword from the parameter list.
If you are defining an operator, you might be able to achieve the Optional functionality with a series of overloads.
If you are defining a delegate or event, you must rework the overall logic of this part of your application. You cannot use Optional or ParamArray parameters, or overloaded versions, on delegate or event parameters.