accordion from database code first FE and MVC

Question

Hi,

would you please tell me how to arrange everything so for evey continent I have countries available?

Here are my models
public class Country
    {
        [Key]
        public int CountryId { get; set; }
        public virtual string CountryName { get; set; }
        public virtual string Abbriviation { get; set; }
        public virtual string Area { get; set; }
        public virtual string CountryCode { get; set; }
        public int ContinentId { get; set; }
        public virtual Continent Continent { get; set; }
    }

public class Continent
    {
   
        [Key]
        public int ContinentId { get; set; }
        public string ContinentName { get; set; }
        public List<Country> Countryes { get; set; }
    }

and available data

1	Africa
2	Antarctica
3	Asia
4	North America
5	South America
6	Europe
7	Australia and Oceania

1	Algeria	DZ	Africa	213	1
2	Angola	AO	Africa	244	1
3	Benin	BJ	Africa	229	1
4	Botswana	BW	Africa	267	1
5	British Indian Ocean Territory	IO	Africa	0	1
6	Burkina Faso	BF	Africa	226	1
7	Burundi	BI	Africa	257	1
8	Côte d'Ivoire	CI	Africa	NULL	1
9	Cameroon	CM	Africa	237	1
10	Cape Verde Islands	CV	Africa	238	1
11	Central African Republic	CF	Africa	236	1
12	Chad	TD	Africa	235	1
13	Comoros	KM	Africa	269	1
14	Congo	CG	Africa	0	1
15	Democratic Republic of the Congo	CD	Africa	243	1
16	Djibouti	DJ	Africa	253	1
17	Egypt	EG	Africa	20	1
18	Equatorial Guinea	GQ	Africa	240	1
19	Eritrea	ER	Africa	291	1
20	Ethiopia	ET	Africa	251	1
21	Gabon	GA	Africa	241	1
22	Gambia	GM	Africa	220	1
23	Ghana	GH	Africa	233	1
24	Guinea	GN	Africa	224	1
25	Guinea-Bissau	GW	Africa	245	1
26	Kenya	KE	Africa	254	1
27	Lesotho	LS	Africa	266	1
28	Liberia	LR	Africa	231	1
29	Libya	LY	Africa	218	1
30	Madagascar	MG	Africa	261	1
31	Malawi	MW	Africa	265	1
32	Mali	ML	Africa	223	1
33	Mauritania	MR	Africa	222	1
34	Mauritius	MU	Africa	230	1
35	Mayotte	YT	Africa	262	1
36	Morocco	MA	Africa	212	1
37	Mozambique	MZ	Africa	258	1
38	Namibia	NA	Africa	264	1
39	Niger	NE	Africa	227	1
40	Nigeria	NG	Africa	234	1
41	RTunion	RE	Africa	0	1
42	Rwanda	RW	Africa	250	1
43	Saint Helena	SH	Africa	290	1
44	Sao Tome and Principe	ST	Africa	239	1
45	Senegal	SN	Africa	221	1
46	Seychelles	SC	Africa	248	1
47	Sierra Leone	SL	Africa	232	1
48	Somalia	SO	Africa	252	1
49	South Africa	ZA	Africa	27	1
50	Sudan	SD	Africa	249	1
51	Swaziland	SZ	Africa	268	1
52	Tanzania	TZ	Africa	255	1
53	Togo	TG	Africa	228	1
54	Tunisia	TN	Africa	216	1
55	Uganda	UG	Africa	256	1
56	Western Sahara	EH	Africa	0	1
57	Zambia	ZM	Africa	260	1
58	Zimbabwe	ZW	Africa	263	1
59	Afghanistan	AF	Asia	93	3
60	Armenia	AM	Asia	374	3
61	Azerbaijan	AZ	Asia	994	3
62	Bahrain	BH	Asia	973	3
63	Bangladesh	BD	Asia	880	3
64	Bhutan	BT	Asia	975	3
65	Brunei	BN	Asia	673	3
66	Cambodia	KH	Asia	855	3
67	China	CN	Asia	86	3
68	Cyprus	CY	Asia	357	3
69	East Timor	TL	Asia	670	3
70	Georgia	GE	Asia	995	3
71	India	IN	Asia	91	3
72	Indonesia	ID	Asia	62	3
73	Iran	IR	Asia	98	3
74	Iraq	IQ	Asia	964	3
75	Israel	IL	Asia	972	3
76	Japan	JP	Asia	81	3
77	Jordan	JO	Asia	962	3
78	Kazakhstan	KZ	Asia	7	3
79	Kuwait	KW	Asia	965	3
80	Kyrgyzstan	KG	Asia	996	3
81	Laos	LA	Asia	856	3
82	Lebanon	LB	Asia	961	3
83	Malaysia	MY	Asia	60	3
84	Maldives	MV	Asia	960	3
85	Mongolia	MN	Asia	976	3
86	Myanmar	MM	Asia	0	3
87	Nepal	NP	Asia	977	3
88	Oman	OM	Asia	968	3
89	Pakistan	PK	Asia	92	3
90	Palestinian West Bank and Gaza	PS	Asia	970	3
91	Philippines	PH	Asia	63	3
92	Qatar	QA	Asia	974	3
93	Saudi Arabia	SA	Asia	966	3
94	Singapore	SG	Asia	65	3
95	Sri Lanka	LK	Asia	94	3
96	Syria	SY	Asia	963	3
97	Taiwan	TW	Asia	886	3
98	Tajikistan	TJ	Asia	992	3
99	Thailand	TH	Asia	66	3
100	Turkey	TR	Asia	90	3
101	Turkmenistan	TM	Asia	993	3
102	United Arab Emirates	AE	Asia	971	3
103	Uzbekistan	UZ	Asia	998	3
104	Viet Nam	VN	Asia	84	3
105	Yemen	YE	Asia	967	3
106	Anguilla	AI	America	1264	4
107	Aruba	AW	America	297	4
108	Bermuda	BM	America	1441	4
109	British Virgin Islands	VG	America	1284	4
110	Cayman Islands	KY	America	1345	4
111	Guadeloupe	GP	America	0	4
112	Martinique	MQ	America	0	4
113	Montserrat	MS	America	1664	4
114	Netherlands Antilles	AN	America	599	4
115	Nicaragua	NI	America	505	4
116	Puerto Rico	PR	America	1	4
117	Saint Pierre and Miquelon	PM	America	508	4
118	Turks and Caicos Islands	TC	America	1649	4
119	Antigua and Barbuda	AG	America	1268	4
120	Bahamas	BS	America	1242	4
121	Barbados	BB	America	1246	4
122	Belize	BZ	America	501	4
123	Canada	CA	America	1	4
124	Costa Rica	CR	America	506	4
125	Cuba	CU	America	53	4
126	Dominica	DM	America	1767	4
127	Dominican Republic	DO	America	1809	4
128	El Salvador	SV	America	503	4
129	Greenland	GL	America	299	4
130	Grenada	GD	America	1473	4
131	Guatemala	GT	America	502	4
132	Haiti	HT	America	509	4
133	Honduras	HN	America	504	4
134	Jamaica	JM	America	1876	4
135	Mexico	MX	America	52	4
136	Panama	PA	America	507	4
137	Saint Kitts and Nevis	KN	America	1869	4
138	Saint Lucia	LC	America	1758	4
139	Saint Vincent and the Grenadines	VC	America	1784	4
140	Trinidad and Tobago	TT	America	1868	4
141	United States	US	America	1	4
142	Argentina	AR	America	54	5
143	Bolivia	BO	America	591	5
144	Brazil	BR	America	55	5
145	Chile	CL	America	56	5
146	Colombia	CO	America	57	5
147	Ecuador	EC	America	593	5
148	Falkland Islands	FK	America	500	5
149	Guyana	GY	America	592	5
150	Guyane frantaise	GF	America	NULL	5
151	Paraguay	PY	America	595	5
152	Peru	PE	America	51	5
153	Suriname	SR	America	597	5
154	U.S. Virgin Islands	VI	America	1340	5
155	Uruguay	UY	America	598	5
156	Venezuela	VE	America	58	5
157	Albania	AL	Europe	355	6
158	Andorra	AD	Europe	376	6
159	Austria	AT	Europe	43	6
160	Belarus	BY	Europe	375	6
161	Belgium	BE	Europe	32	6
162	Bosnia and Herzegovina	BA	Europe	387	6
163	Bulgaria	BG	Europe	359	6
164	Croatia	HR	Europe	385	6
165	Czech Republic	CZ	Europe	420	6
166	Denmark	DK	Europe	45	6
167	Estonia	EE	Europe	372	6
168	Finland	FI	Europe	358	6
169	France	FR	Europe	33	6
170	Germany	DE	Europe	49	6
171	Gibraltar	GI	Europe	350	6
172	Greece	GR	Europe	30	6
173	Holy See (Vatican City)	VA	Europe	39	6
174	Hungary	HU	Europe	36	6
175	Iceland	IS	Europe	354	6
176	Ireland	IE	Europe	353	6
177	Italy	IT	Europe	39	6
178	Latvia	LV	Europe	371	6
179	Liechtenstein	LI	Europe	423	6
180	Lithuania	LT	Europe	370	6
181	Luxembourg	LU	Europe	352	6
182	Macedonia	MK	Europe	389	6
183	Malta	MT	Europe	356	6
184	Moldova	MD	Europe	373	6
185	Monaco	MC	Europe	377	6
186	Montenegro	ME	Europe	382	6
187	Netherlands	NL	Europe	31	6
188	Norway	NO	Europe	47	6
189	Poland	PL	Europe	48	6
190	Portugal	PT	Europe	351	6
191	Romania	RO	Europe	40	6
192	Russian Federation	RU	Europe	7	6
193	San Marino	SM	Europe	378	6
194	Serbia	RS	Europe	381	6
195	Slovakia	SK	Europe	421	6
196	Slovenia	SI	Europe	386	6
197	Spain	ES	Europe	34	6
198	Sweden	SE	Europe	46	6
199	Switzerland	CH	Europe	41	6
200	Ukraine	UA	Europe	380	6
201	United Kingdom	GB	Europe	44	6
202	American Samoa	AS	Pacific	1684	7
203	Australia	AU	Pacific	61	7
204	Cook Islands	CK	Pacific	682	7
205	Fiji	FJ	Pacific	679	7
206	French Polynesia	PF	Pacific	689	7
207	Guam	GU	Pacific	1671	7
208	Kiribati	KI	Pacific	686	7
209	Marshall Islands	MH	Pacific	692	7
210	Micronesia	FM	Pacific	691	7
211	Nauru	NR	Pacific	674	7
212	New Caledonia	NC	Pacific	687	7
213	New Zealand	NZ	Pacific	64	7
214	Niue	NU	Pacific	683	7
215	Norfolk Island	NF	Pacific	672	7
216	Northern Mariana Islands	MP	Pacific	1670	7
217	Palau	PW	Pacific	680	7
218	Papua New Guinea	PG	Pacific	675	7
219	Pitcairn	PN	Pacific	870	7
220	Samoa	WS	Pacific	685	7
221	Solomon Islands	SB	Pacific	677	7
222	Tokelau	TK	Pacific	690	7
223	Tonga	TO	Pacific	676	7
224	Tuvalu	TV	Pacific	688	7
225	Vanuatu	VU	Pacific	678	7
226	Wallis and Futuna	WF	Pacific	681	7

Thank you.