Open the /ClientApp/src/app/countries/country-edit.component.ts file and fill it with the following code. Watch out for the highlighted parts, which are rather different from the previous CityEditComponent; other minor differences, such as country instead of city, are not highlighted, since they're more than expected:
import { Component, Inject } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { ActivatedRoute, Router } from '@angular/router';
import { FormGroup, FormBuilder, Validators, AbstractControl, AsyncValidatorFn } from '@angular/forms';
import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';
import { Country } from './../countries/Country';
@Component({
selector: 'app-country-edit',
templateUrl: './country-edit.component.html',
styleUrls: ['./country-edit.component.css']
})
export class...