IServiceCollection AddAuthorization - Missing assembly reference

Hi All,

I am trying to implement Authorization Policy in Asp.Net MVC. I am using Visual Studio 2017 community edition for my development.

1. Missing assembly reference for IServiceCollection - I installed Microsoft.Extensions.DependencyInjection & Microsoft.Extensions.DependencyInjection.Abstractions
2. Now I am getting error in services.AddAuthorization - IServiceCollection doesnot contain a definition for AddAuthorization. It is showing an error as "assembly reference missing", please let me know which assembly I need to add for fixing this issue.

public void ConfigureServices(IServiceCollection services)
{
services.AddAuthorization(options =>
{
options.AddPolicy("Projects.View",
policy => policy.RequireClaim("Permission", "projects.view"));
});
}

Thanks

Selvakumar R