Cant read values from Json file after publishing

I can read values (value1,Value2) while development, Cant read them after publishing what maybe the problem?

public  IConfigurationRoot Configuration { get; set; }

public Startup(IHostingEnvironment env)
    {
        Configuration = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json")
        .Build();
    }

public void readValues()
    {
        var val1 = ($"{Configuration["Value1"]}");
        var val2 = ($"{Configuration["Value2"]}");
    }

Json:

    {
       "Value1": "Hello",
       "Value2": "World"
    }

Change your constructor that you added to this:

public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json");

            Configuration = builder.Build();
        }

public IConfiguration Configuration { get; }

This will work just fine.