SQL Insert Statement

public static void AddNewInventory(string stu_name, string address, string Phone, string date)
        {
            string sql = "BEGIN Insert into I_Student " +
                "(Student_ID, STU_Name, Address, Phone, DATE )" +
                    "Values(I_Student_ID.NextVAL, :STU_Name, :Address, :Phone,to_date(:DATE, 'MM/DD/YYYY HH24:MI:SS')); END; ";

            Console.WriteLine("Insert SQL = " + sql.ToString());
            OracleDatabase db = (OracleDatabase)DatabaseFactory.CreateDatabase("PHTS");

            using (System.Data.Common.DbCommand cmd = db.GetSqlStringCommand(sql))
            {


                db.AddInParameter(cmd, "STU_Name", DbType.String,stu_name);
                db.AddInParameter(cmd, "Address", DbType.String,address);
                db.AddInParameter(cmd, "Phone", DbType.String,Phone);
                db.AddInParameter(cmd, "DATE", DbType.String,date);

               db.ExecuteNonQuery(cmd);

            }

        }
    }