fill HttpPostedFileBase varible in mvc

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MVC

hi
how can i read a file from folder (~/Content/files) and put it into a HttpPostedFileBase varible.
my class

public class estandardclass
    {

        public long id { get; set; }

        public string namefile { get; set; }

        public HttpPostedFileBase fileEstandard { get; set; }

        
       }

i wanna read standard100.pdf from ~/Content/files and put it in fileEstandard.