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Compiler Error C3618

'function': a method marked DllImport cannot be defined

A method marked with DllImportAttribute is defined in the specified.DLL.

The following sample generates C3618.

// C3618.cpp
// compile with: /clr /c
using namespace System;
using namespace System::Runtime::InteropServices;

[ DllImport("user32.dll", EntryPoint="MessageBox", CharSet=CharSet::Ansi) ]  // CHANGED 
void Func(); 

void Func() {}   // C3618, remove this function definition to resolve

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