visual studio 2010 unit testing Write file

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For c++ Visual studio 2010 unit testing framework ,how can i creat a file and add the datas to file?
I tried the below code after Assert::AreEqual
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.n";
myfile.close();
But this shows a linker error
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std._String_const_iterator<char,std::char_traits<char>,std::allocator<char> >): (0x02000019).
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std.basic_string<char,std::char_traits<char>,std::allocator<char> >): (0x0200003d).
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std.basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >): (0x02000063).
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std._String_iterator<char,std::char_traits<char>,std::allocator<char> >): (0x02000080).
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std._String_val<char,std::allocator<char> >): (0x02000081).
1>MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std._String_val<wchar_t,std::allocator<wchar_t> >): (0x02000083).
1>LINK : fatal error LNK1255: link failed because of metadata errors

After i compile with the option /clr it shows the abve error.
Is there any other option to use in Unit testing with System::IO? or something to write to File?

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