Debugging runs even with compiler's errors in Visual Studio

When I start debugging a project in Visual Studio 2010 (开发者_Python百科F5), the applications runs even if there are compiler's errors. Why is this so? How can I repair this?

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Menu, Tools->Options

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You might have set it to run from the last known successful build.

Look here for more details : How to enable/disable compile errors warning in Visual Studio

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This behaviour is by-design when the project is a Website. Visual Studio will start the web development server even before it ends compilation of all webpages. This happens because a Website is supposed to compile on demand, that is when the specific pages are requested. Web applications on the other hand, are precompiled.

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If you have multiple projects in the same solution and the errors are occuring in a project that isn't required by the startup project, then I think the code will launch.