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    <p>You need to have classes A and B in the same assembly and class C in another assembly. <strike>You can mark the member you want to restrict access to by derived classes as <code>protected internal</code>. This makes the member, well, protected and internal. As far as limiting class <code>C</code>'s access to the member it will suffice to mark it <code>internal</code>. Since this will make it it <code>public</code> within the first assembly, you might want to add <code>protected</code> to enforce encapsulation.</strike></p> <p>Turns out marking a member <code>protected internal</code> doesn't make it private to classes outside of the assembly. Seems that for all intents and purposes <code>protected internal</code> is the same as protected. Unfortunately the only way I can see achieving this would be to mark it internal and put up with the member being public to the defining assembly.</p> <p>Even <a href="http://msdn.microsoft.com/en-us/library/ms173121%28VS.80%29.aspx" rel="nofollow noreferrer">C# programming guide on MSDN</a> gets it wrong:</p> <blockquote> <p>By combining the protected and internal keywords, a class member can be marked protected internal — only derived types or types within the same assembly can access that member.</p> </blockquote> <p>Phil Haack <a href="http://haacked.com/archive/2007/10/29/what-does-protected-internal-mean.aspx" rel="nofollow noreferrer">explains</a>:</p> <blockquote> <p><code>protected internal</code> <strong>means</strong> <code>protected</code> <strong>OR</strong> <code>internal</code></p> <p>It’s very clear when you think of the keywords as the union of accessibility rather than the intersection. Thus <code>protected interna</code> means the method is accessible by anything that can access the <code>protected</code> method UNION with anything that can access the <code>internal</code> method.</p> </blockquote> <p>Here is the updated code:</p> <pre><code> class A { protected void Test3(){} //available to subclasses of A in any assembly protected internal void Test() { } //Same as protected :( public void Test2(){}//available to everyone internal void Test4(){} //available to any class in A's assembly } class B : A { void TestA() { Test(); //OK } } //Different assembly class C : B { void TestA() { Test4(); //error CS0103: The name 'Test4' does not exist in the current context } } </code></pre>
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    1. POAm I trying to Implement Multiple Inheritance. How can I do this
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    1. USIgor Zevaka
    1. USIgor Zevaka
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    1. CO@lgor: In this case, how will i be able to use other six functions that were defined in Class A, by making them public ?
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      1. USShantanu Gupta
    2. COYep. see code for clarification.
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      1. USIgor Zevaka
    3. COI wish I could upvote this more than once. Great illustration!!
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