two errors
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1>ModifyDlg.obj : error LNK2001: 无法解析的外部符号 "public: virtual int __thiscall CModifyDlg::OnInitDialog(void)" (?OnInitDialog@CModifyDlg@@UAEHXZ) 1>WorkDlg.obj : error LNK2001: 无法解析的外部符号 "protected: virtual int __thiscall CWorkDlg::OnInitDialog(void)" (?OnInitDialog@CWorkDlg@@MAEHXZ)
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1>ModifyDlg.obj : error LNK2001: 无法解析的外部符号 "public: virtual int __thiscall CModifyDlg::OnInitDialog(void)" (?OnInitDialog@CModifyDlg@@UAEHXZ) 1>WorkDlg.obj : error LNK2001: 无法解析的外部符号 "protected: virtual int __thiscall CWorkDlg::OnInitDialog(void)" (?OnInitDialog@CWorkDlg@@MAEHXZ)
[Linker Tools Error LNK2001](https://msdn.microsoft.com/en-us/library/f6xx1b1z.aspx) [How to fix?: error LNK2001: unresolved external symbol "extern "C" ........](https://social.msdn.microsoft.com/Forums/vstudio/en-US/4523e57a-c16b-4378-8c42-52f7cf5b98da/how-to-fix-error-lnk2001-unresolved-external-symbol-extern-c-?forum=vclanguage) [error LNK2001 - Google Search](https://www.google.de/search?q=error+LNK2001&oq=error+LNK2001&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8)