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    <p>Use the 'ref' keyword when the you need to modify <em>what the reference is pointing to</em>. When you pass a reference type into a method it <em>is</em> passed by value, but the value is a <em>copy</em> of that reference which is passed to the method. This means that you can change the general state (i.e., properties/fields) of the referred to object, but if you attempt to change what the reference points to you will only affect the copy.</p> <p>For example, given this method...</p> <pre><code>private void Foo( MyClass obj ) { obj = new MyClass( ); obj.SomeProperty = true; } </code></pre> <p>We can pass in the argument and then see if it was affected:</p> <pre><code>MyClass test = new MyClass( ); test.SomeProperty = false; Foo( test ); Console.WriteLine( test.SomeProperty ); // prints "False" </code></pre> <p>Now, if we had defined the method using the 'ref' keyword...</p> <pre><code>private void Foo( ref MyClass obj ) { obj = new MyClass( ); obj.SomeProperty = true; } </code></pre> <p>The output would be "True", because the actual reference was passed to the method, not a copy. We changed what that reference points to within the function and we see the effects of those changes.</p> <p>You are just creating a new pointer to the object on the heap when you omit the 'ref' keyword. If you change one pointer you will not change the other.</p> <p>...</p> <p>So, to answer your question; no, you do not need to use the 'ref' keyword to change the state of your single Cache object when it is passed to a method.</p>
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    1. POPassing by ref?
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    1. COIt is so much simpler with normal C/C++ pointers :)
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    2. COI disagree :) But for the c/c++ people it's the difference between * (or &) and ** :)
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    3. COnitpick: 2nd example - you are accessing a static property.
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