Program.cs

using CustomerWebApi;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();

///* Database Context Dependency Injection */
//var dbHost = Environment.GetEnvironmentVariable("DESKTOP-TGLDFBO\\SQLEXPRESS");  //DB_HOST
//var dbName = Environment.GetEnvironmentVariable("MicroServices");//DB_NAME
//var dbPassword = Environment.GetEnvironmentVariable("123456");


/* Database Context Dependency Injection */
var dbHost = "DESKTOP-TGLDFBO\\SQLEXPRESS";  //DB_HOST
var dbName = "MicroServices";//DB_NAME
var dbPassword = "123456";
var connectionString = $"Data Source={dbHost};Initial Catalog={dbName};User ID=sa;Password={dbPassword}";
builder.Services.AddDbContext<CustomerDbContext>(opt => opt.UseSqlServer(connectionString));
/* ===================================== */

var app = builder.Build();

// Configure the HTTP request pipeline.

app.UseAuthorization();

app.MapControllers();

app.Run();