Как убрать данную ошибку?

Question

[alexxxey_code]

public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            string conString = Configuration["ConnectionStrings:DefaultConnection"];
            services.AddDbContext<DataContext>(options =>
            options.UseSqlServer(conString));
        }

public class DataContext : DbContext
    {
        public DataContext(DbContextOptions<DataContext> options) : base(options) { }
        public DbSet<GuestResponse> Responses { get; set; }

    }

public class HomeController : Controller
    {
        private DataContext context;
        public HomeController(DataContext ctx) => context = ctx;
        public IActionResult Index() => View();
        public IActionResult Respond() => View();

        [HttpPost]
        public IActionResult Respond(GuestResponse response)
        {
            context.Responses.Add(response);
            context.SaveChanges();
            return RedirectToAction(nameof(Thanks),
                new { Name = response.Name, WillAttend = response.WillAttend });
        }
        public IActionResult Thanks(GuestResponse response) => View(response);
        public IActionResult ListResponses() =>
            View(context.Responses.OrderByDescending(r => r.WillAttend));

    }

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>
	<ItemGroup>
		<Folder Include="wwwroot\" />
	</ItemGroup>
	
    <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.5" />

    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.5">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </DotNetCliToolReference>
	  
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="5.0.2" />
    </ItemGroup>

</Project>

Answer 1

[oleg_ods]

Нет библиотеки SqlServer. NuGet