Program.cs

using CustomerCRUD.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;


var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DBConnection");
builder.Services.AddDbContextPool<CustomerContext>(option => option.UseSqlServer(connectionString));

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddCors(options => options.AddPolicy(name: "CustomerOrigin",
    policy =>
    {
        policy.WithOrigins("http://localhost:4200").AllowAnyMethod().AllowAnyHeader();
    }
    ));

//builder.Services.AddCors(o => o.AddPolicy("CustomerOrigin", corsbuilder =>
//{
//    corsbuilder.AllowAnyOrigin()
//       .AllowAnyMethod()
//       .AllowAnyHeader();

//}));
var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();
app.UseCors("CustomerOrigin");

app.Run();