How to resolve this error

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LINQ

MVC

How to resolve this error
This function can only be invoked from LINQ to Entities.

The code which causes this error:

var usrModel = new UserRegisterModel();

Country curid = snwe.Countries.Where(a => a.Country1 == "India").FirstOrDefault();

usrModel.Countries = snwe.Countries.AsEnumerable().Select(C => new SelectListItem {
   Text = C.Country1,
   Value = SqlFunctions.StringConvert((double)C.CountryID).Trim(),
   Selected = C.CountryID == curid.CountryID ? true : false
});