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                        private static string GetMultipartFileContentType(string file)
{
    var ext = file.Split('.').Last().ToLower();
    var types = new[]
    {
        new[] {"application/envoy","evy"},
        new[] {"application/fractals","fif"},
        new[] {"application/futuresplash","spl"},
        new[] {"application/hta","hta"},
        new[] {"application/internet-property-stream","acx"},
        new[] {"application/mac-binhex40","hqx"},
        new[] {"application/msword","doc"},
        new[] {"application/msword","dot"},
        new[] {"application/octet-stream","*"},
        new[] {"application/octet-stream","bin"},
        new[] {"application/octet-stream","class"},
        new[] {"application/octet-stream","dms"},
        new[] {"application/octet-stream","exe"},
        new[] {"application/octet-stream","lha"},
        new[] {"application/octet-stream","lzh"},
        new[] {"application/oda","oda"},
        // Многобукв...
        new[] {"x-world/x-vrml","xof"}
    };
    var toReturn = types.FirstOrDefault(t => t[1] == ext);
    return toReturn != null ? toReturn[0] : "application/octet-stream";
}