Yes, it's possible to write Mac applications with Visual Basic, Visual C#, Visual C++ or Visual J# Express.
Since .NET Framework uses Common Language Infrastructure (CLI) Virtual Machine, all we need to do is to install equivalent of .NET Framework for OS X, and all applications written for .NET Framework should work on OS X.
In Creating Mac OS X applications with MS Visual Studio Express, we will tell you how easy it is. Just need to download a few tools and they are all free. (Microsoft Visual Studio 2005 Express is free as well.)
I do not recommend using Visual Basic, Visual C#, Visual C++ or Visual J# Express to create applications for Mac, but to demonstrate it's doable. Apple's Xcode is still the preferred software.
For more detail, please read Creating Mac OS X applications with MS Visual Studio Express.
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