title: Linker errors LNK1120 and LNK2001
body: <p>I hate these linker errors, any idea how I can get rid of them?</p>
  
  <pre><code>Error   2   fatal error LNK1120: 1 unresolved externals C:\Users\**********\Documents\Visual Studio 2005\Projects\Machine2\Debug\Machine2.exe
  </code></pre>
  
  <p>and</p>
  
  <pre><code>Error   1   error LNK2001: unresolved external symbol "public: void __thiscall SecondDlg::OnBnClickedButton4(void)" (?OnBnClickedButton4@SecondDlg@@QAEXXZ) SecondDlg.obj
  </code></pre>