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    <p>Interessting feature :-) I've never noticed that.</p> <p>I've taken a look at the IL. This doesn't explain the behaviour (the compilation process), but it documents the result anyway, I believe.</p> <p>The whole C# code line is clearly left out in the IL:</p> <ul> <li>In the DEBUG compilation a new object is created (the x variable), stored at location 0 and loaded. Afterwards the three methods are applied successively: DoSideEffects(), DeMoreSideEffects(), and ConditionalMethod()</li> <li>In the RELEASE compilation the variable still gets created, but since it is not needed, it is immediately pop'ed. Instead the y variable is stored at location 0 and loaded. </li> </ul> <p>To me, this looks like a bug, really. It seems that it would have been possible to just exclude the ConditionalMethod() call in the IL. But it seems that you are right, that the whole line is left out.</p> <pre><code>// DEBUG compilation .method private hidebysig static void Main() cil managed { .entrypoint // Code size 58 (0x3a) .maxstack 1 .locals init (class ConsoleApplication3.InstanceType V_0, class ConsoleApplication3.InstanceType V_1) IL_0000: nop IL_0001: newobj instance void ConsoleApplication3.InstanceType::.ctor() IL_0006: stloc.0 IL_0007: ldloc.0 IL_0008: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoSideEffects() IL_000d: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoMoreSideEffects() IL_0012: callvirt instance void ConsoleApplication3.InstanceType::ConditionalMethod() IL_0017: nop IL_0018: newobj instance void ConsoleApplication3.InstanceType::.ctor() IL_001d: stloc.1 IL_001e: ldloc.1 IL_001f: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoSideEffects() IL_0024: pop IL_0025: ldloc.1 IL_0026: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoMoreSideEffects() IL_002b: pop IL_002c: ldloc.1 IL_002d: callvirt instance void ConsoleApplication3.InstanceType::ConditionalMethod() IL_0032: nop IL_0033: call valuetype [mscorlib]System.ConsoleKeyInfo [mscorlib]System.Console::ReadKey() IL_0038: pop IL_0039: ret } // end of method Program::Main // RELEASE compilation .method private hidebysig static void Main() cil managed { .entrypoint // Code size 33 (0x21) .maxstack 1 .locals init ([0] class ConsoleApplication3.InstanceType y) IL_0000: newobj instance void ConsoleApplication3.InstanceType::.ctor() IL_0005: pop IL_0006: newobj instance void ConsoleApplication3.InstanceType::.ctor() IL_000b: stloc.0 IL_000c: ldloc.0 IL_000d: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoSideEffects() IL_0012: pop IL_0013: ldloc.0 IL_0014: callvirt instance class ConsoleApplication3.InstanceType ConsoleApplication3.InstanceType::DoMoreSideEffects() IL_0019: pop IL_001a: call valuetype [mscorlib]System.ConsoleKeyInfo [mscorlib]System.Console::ReadKey() IL_001f: pop IL_0020: ret } // end of method Program::Main </code></pre>
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