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    <p>This is a frequently asked question; see also:</p> <p><a href="https://stackoverflow.com/questions/3133680">Lambda variable scope</a></p> <p><a href="https://stackoverflow.com/questions/2630244">C# going nuts when I declare variables with the same name as the ones in a lambda</a></p> <p><a href="https://stackoverflow.com/questions/2049330">C# variable scoping: &#39;x&#39; cannot be declared in this scope because it would give a different meaning to &#39;x&#39;</a></p> <p><a href="https://stackoverflow.com/questions/1196941">Variable scope confusion in C#</a></p> <p>The answer is: read the error message more carefully. The error message states exactly what the problem is: <em>you are not allowed to use the same simple name to mean two different things in the same block.</em> </p> <p>For example:</p> <pre><code>class C { int x; void M() { int x; } } </code></pre> <p><strong>Perfectly legal.</strong> Note that the scope of the outer x <em>overlaps</em> the scope of the inner x. It is <em>not</em> illegal to have overlapping scopes with the same name in scope in both.</p> <p>This is not legal:</p> <pre><code>class C { int x; void M() { Console.WriteLine(x); // this.x { int x; } } } </code></pre> <p>Again, the two scopes both with an x overlapping is perfectly legal. What is illegal is that the simple name x is used two mean <em>two different variables in the same block</em> - that is, within the outer block of M(), which <em>contains</em> the inner block of M.</p> <p>Programs where the same simple name is <em>used</em> to mean two different things in the same block are <em>confusing</em> and <em>bug prone</em> and therefore are <em>illegal</em> in C#.</p> <p>For more details read my articles on the subject:</p> <p><a href="http://blogs.msdn.com/b/ericlippert/archive/tags/simple+names/" rel="nofollow noreferrer">http://blogs.msdn.com/b/ericlippert/archive/tags/simple+names/</a></p>
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    1. COThank you so much for this detailed answer!
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