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    <p>I'm arriving a bit late to the party, but I've got <strike>three</strike> <strike>four</strike> five:</p> <ol> <li><p>If you poll InvokeRequired on a control that hasn't been loaded/shown, it will say false - and blow up in your face if you try to change it from another thread (<a href="https://stackoverflow.com/questions/246058/system-invalidoperationexception-the-object-is-currently-in-use-elsewhere-ho">the solution</a> is to reference this.Handle in the creator of the control).</p></li> <li><p>Another one which tripped me up is that given an assembly with:</p> <pre><code>enum MyEnum { Red, Blue, } </code></pre> <p>if you calculate MyEnum.Red.ToString() in another assembly, and in between times someone has recompiled your enum to:</p> <pre><code>enum MyEnum { Black, Red, Blue, } </code></pre> <p>at runtime, you will get "Black".</p></li> <li><p>I had a shared assembly with some handy constants in. My predecessor had left a load of ugly-looking get-only properties, I thought I'd get rid of the clutter and just use public const. I was more than a little surprised when VS compiled them to their values, and not references.</p></li> <li><p>If you implement a new method of an interface from another assembly, but you rebuild referencing the old version of that assembly, you get a TypeLoadException (no implementation of 'NewMethod'), even though you <em>have</em> implemented it (see <a href="https://stackoverflow.com/questions/948785/typeloadexception-says-no-implementation-but-it-is-implemented">here</a>).</p></li> <li><p>Dictionary&lt;,>: "The order in which the items are returned is undefined". This is <em>horrible</em>, because it can bite you sometimes, but work others, and if you've just blindly assumed that Dictionary is going to play nice ("why shouldn't it? I thought, List does"), you really have to have your nose in it before you finally start to question your assumption.</p></li> </ol>
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    1. POWhat's the strangest corner case you've seen in C# or .NET?
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    1. CO#2 is an interesting example. Enums are compiler mappings to integral values. So even though you didn't explicitly assign them values, the compiler did, resulting in MyEnum.Red = 0 and MyEnum.Blue = 1. When you added Black, you redefined the value 0 to map from Red to Black. I suspect that the problem would have manifested in other usages as well, such as Serialization.
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    2. CO+1 for Invoke required. At ours' we prefer to explicitly assign values to enums like Red=1,Blue=2 so new one can be inserted before or after it will always result in same value. It is specially necessary if you are saving values to databases.
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    3. CO@aman.tur, you might be interested in this question: http://stackoverflow.com/questions/881726/using-hashcode-to-generate-value-for-enum
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