public ActionResult Edit(int id)
{
    var e = db.Files.Find(id);
    var vm = new ClientInfoVM() { ClientID = id, FileName = e.FileName };
    vm.Content = e.Content;

    if (e.Content != null)
    {
        vm.Content = $"data:image/jpg;base64,{Convert.ToBase64String(e.Content)}";
    }

public partial class client__information
{
[Key]
public int ClientID { get; set; }

public long AccountNumber { get; set; }

[Required]
[StringLength(30)]
public string FirstName { get; set; }

[StringLength(30)]
public string MiddleName { get; set; }

[Required]
[StringLength(30)]
public string LastName { get; set; }

[StringLength(30)]
public string NickName { get; set; }

[Column(TypeName = "date")]
[DataType(DataType.Date)]
public DateTime DOB { get; set; }

public int? GenderTypeID { get; set; }
[ForeignKey("GenderTypeID")]
public virtual data__gender_codes Gender { get; set; }

[ForeignKey("LocationID")]
public long? FacilityID { get; set; }
public virtual facility__information__location__names LocationID { get; set; }

public long? StatusID { get; set; }
[ForeignKey("StatusID")]
public virtual client__information__status__codes SID { get; set; }

[Column(TypeName = "date")]
public DateTime StartDate { get; set; }

public int StartTimeID { get; set; }
[ForeignKey("StartTimeID")]
public virtual data__start_times STID { get; set; }

[Column(TypeName = "date")]
public DateTime? EndDate { get; set; }

public byte? EndTime { get; set; }

public long ResponsiblePartyID { get; set; }

public DateTime DateAdded { get; set; }

public long AddedBy { get; set; }

public DateTime DateChanged { get; set; }

public int? ChangedBy { get; set; }

[Column(TypeName = "date")]
public DateTime? DestroyDate { get; set; }

public virtual ICollection<File> Files { get; set; }

}

public class File
{
public int FileId { get; set; }
[StringLength(255)]
public string FileName { get; set; }
[StringLength(100)]
public string ContentType { get; set; }
public byte[] Content { get; set; }
public FileType FileType { get; set; }
public int UserId { get; set; }
public virtual client__information Client__Information { get; set; }
}

public class ClientInfoVM
{
//client__information Model
public int ClientID { get; set; }
public long AccountNumber { get; set; }
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string LastName { get; set; }
public string NickName { get; set; }
public DateTime DOB { get; set; }
public int? GenderTypeID { get; set; }
public long? FacilityID { get; set; }
public long? StatusID { get; set; }
public DateTime StartDate { get; set; }
public int StartTimeID { get; set; }
public DateTime? EndDate { get; set; }
public byte? EndTime { get; set; }
public long ResponsiblePartyID { get; set; }
public long AddedBy { get; set; }
public DateTime DateChanged { get; set; }
public int? ChangedBy { get; set; }
public DateTime? DestroyDate { get; set; }
public virtual ICollection<File> Files { get; set; }

//File Model
public string FileName { get; set; }
public HttpPostedFileBase Content { get; set; }
public int FileId { get; set; }
public string ContentType { get; set; }
public FileType FileType { get; set; }


}

"cannot implicitly convert type 'string' to 'System.Web.HttpPostedFileBase"