Remotely/Server/Data/SqlServerDbContext.cs

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Remotely.Server.Data
{
    public class SqlServerDbContext : ApplicationDbContext
    {
        private readonly IConfiguration _configuration;

        public SqlServerDbContext(DbContextOptions context, IConfiguration configuration)
            : base(context)
        {
            _configuration = configuration;
        }

        protected override void OnConfiguring(DbContextOptionsBuilder options) => 
            options.UseSqlServer(_configuration.GetConnectionString("SQLServer"));
    }
}