how fill dropdwon list from datadbase?

// how can i fill dropdown list in department list,standard list, semester list,stream list when i add subject and chapter  //
i have two different table tbl_dipart and chepter //
// department model//

namespace firstapp.Models
{
    public class dipartment  
    {

        public int dip_id { get; set; }

        public string dipart { get; set; }

        public string std { get; set; }

        public string sem { get; set; }

        public string strem { get; set; }
    }
}
// chapter model//

namespace firstapp.Models
{
    public class chepter
    {
        [ForeignKey("dip_id")]
        public int dipart_id { get; set; }

        public int chep_id { get; set; }

        public string subject { get; set; }

        public string chepter { get; set; }

        public List<dipartment> dipartlist { get; set; }

        public List<dipartment> stdlist { get; set; }

        public List<dipartment> semlist { get; set; }

        public List<dipartment> stremlist { get; set; }


    }
}
//please help me //thank you in advance.....