Error angular 8 No 'Access-Control-Allow-Origin' header is present on the requested resource

I am new to Angular and I am trying to fetch data from webApi controller and displaying it on button click but, when I click on a button, I get error:

Access to XMLHttpRequest at 'http://localhost:5000/api/values' from origin 'https://localhost:5003' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

This is my WebApi Values Controller:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore.Mvc;

    namespace DataApi.Controllers
    {
        [Route("api/[controller]")]
        public class ValuesController : Controller
        {
            // GET api/values
            [HttpGet]
            public IEnumerable<string> Get()
            {
                return new string[] { "value1", "value3" };
            }

        }
    }

This is my value.component.ts file:

import { Component, OnInit } from '@angular/core';
import { Http  } from '@angular/http';
import {  HttpHeaders } from '@angular/common/http';

@Component({
  selector: 'app-value',
  templateUrl: './value.component.html',
  styleUrls: ['./value.component.css']
})
export class ValueComponent implements OnInit {
  value = {};
  constructor(private http: Http) { }

  ngOnInit() {
  }
  getValues() {
    const headers = new HttpHeaders().set('Content-Type', 'text/plain; charset=utf-8');
      this.http.get(`http://localhost:5000/api/values`).subscribe ( response => this.value = 
 response.json());
    }
}

This is my value.component.html:

<p>value works!</p>
<div>
    <button (click)="getValues()">Load values</button>
    {{ value | json }}
  </div>

This is my app.module.ts:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { ValueComponent } from './value/value.component';
import { HttpModule } from '@angular/http';
import { RouterModule, Routes } from '@angular/router';

const appRoutes: Routes = [
  {path: '', redirectTo: 'value', pathMatch: 'full' },
  { path: 'value',  component: ValueComponent },
  { path: '**', redirectTo: ''}
];


@NgModule({
  declarations: [
    AppComponent,
    ValueComponent
  ],
  imports: [
    BrowserModule,
    HttpModule,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

When I debug the project and click on the button, I get the error.

As I am new to Angular, I don't know what to do. When I click this URL: http://localhost:5000/api/values I get my values.