Link Error using C++ with WinForms


Hello I'm following a tut using VS 2015 and this guy is using VS 2010 so the whole setup is different. When I run my program I'm getting this error message: error LINK1561: entry point must be defined.
I'm pretty sure I need to go to properties and link it but I don't know what to do!!!

What does this mean and how do I fix this?

Thanks
AO!
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