let s:current_fileformats = ''
let s:current_fileencodings = ''

function! s:vsfiletype_pre()
    let s:current_fileformats = &g:fileformats
    let s:current_fileencodings = &g:fileencodings
    set fileencodings=utf-8 fileformats=unix
    setlocal filetype=vs
endfunction

function! s:vsfiletype_post()
    let &g:fileformats = s:current_fileformats
    let &g:fileencodings = s:current_fileencodings
endfunction

au BufNewFile   *.cs,*.csproj,*.vb,*.vbproj,*.sln,*.aspx setlocal filetype=vs fileencoding=utf-8 fileformat=unix
au BufRead      *.cs,*.csproj,*.vb,*.vbproj,*.sln,*.aspx call s:vsfiletype_pre()
au BufReadPost  *.cs,*.csproj,*.vb,*.vbproj,*.sln,*.aspx call s:vsfiletype_post()