Public class is inaccessible due to its protection level

Question

I have the following classes   namespace Bla Bla        public abstract class ClassA                public virtual void Setup string thing                                public abstract bool IsThingValid             public abstract void ReadThings             public virtual void MatchThings                public virtual void SaveThings                public void Run string thing                         Setup thing                if   IsThingValid                                               ReadThings                MatchThings                SaveThings                       namespace Bla Bla        public class ClassB   ClassA                ClassB                 public override void IsThingValid                          throw new NotImplementedException                       public override void ReadThings                          throw new NotImplementedException                        Now I try to do the following   public class ClassC        public void Main                  var thing   new ClassB            ClassB Run  thing              Which returns the following error  ClassB is inaccessible due to its protection level   But they are all public

User · Accepted Answer

This error is a result of the protection level of ClassB's constructor, not ClassB itself. Since the name of the constructor is the same as the name of the class^*, the error may be interpreted incorrectly. Since you did not specify the protection level of your constructor, it is assumed to be internal by default. Declaring the constructor public will fix this problem:

public ClassB() { }

^*One could also say that constructors have no name, only a type; this does not change the essence of the problem.

User · Answer

Also if you want to do something like ClassB Run  thing     make sure the Method Run    is static or you could call it like this  thing Run  thing

User · Answer

You could go into the designer of the web form and change the  webcontrols  to be  public  instead of  protected  but I m not sure how safe that is  I prefer to make hidden inputs and have some jQuery set the values into those hidden inputs  then create public properties in the web form s class  code behind   and access the values that way

[c#] Public class is inaccessible due to its protection level

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