how i can convert bit data type Image to type picturebox my Error is in the line "dr[8]" "EmployeePicture"

     public bool SelectEmployee()
        {



            bool blnExist = false;
            SqlDataReader dr = SqlHelper.ExecuteReader(gstrCnn, "sp_Employee_SelectRow");
            while (dr.Read())
            {

                _IdEmployee = Convert.ToInt32(dr[0]);
                CodEmployee = dr[1].ToString();
                Name = dr[2].ToString();
               LastName = dr[3].ToString();
                DateStart = Convert.ToDateTime(dr[4]);
                State = Convert.ToBoolean(dr[5]);
                IdSociety= Convert.ToInt32(dr[6]);
                IdEmployeeCharge = Convert.ToInt32(dr[7]);
                EmployeePicture = (dr[8]);
                gstrUserName = dr[9].ToString();



                blnExist = true;
            }
            return blnExist;

}
         #Region

        private int _IdEmployee;
          public int IdEmployee
            {
              get
              {
                 return _IdEmployee;
              }
            }

        
        public string CodEmployee { get; set; }
        public string Name { get; set; }
        public string LastName { get; set; }
        public DateTime DateStart { get; set; }
        public bool State { get; set; }
        public int IdSociety{ get; set; }
        public int IdEmployeeCharge { get; set; }
        public PictureBox FotoServidor { get; set; }

        #endregion


        }