Base. Check Sealed Method
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Checks whether this object is read-only and cannot be changed.
protected: void CheckSealed();
protected void CheckSealed ();
member this.CheckSealed : unit -> unit
Protected Sub CheckSealed ()
Classes that derive from SetterBase must call this method before applying any changes to the state of the object. If the object is read-only and you try to modify the state of the object, an exception is thrown.