NopCommerce 4.1 - EF Migration

1. Install the Package Manager Console tools by running the following command in Package Manager Console:
   
   Install-Package Microsoft.EntityFrameworkCore.Tools
   Reference: .Net Core EF Migration - https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/
2. Add connection string into appsettings.json
   "ConnectionStrings": { "nopCommerce": "Data Source=.;Initial Catalog=nopdb;Integrated Security=False;Persist Security Info=False;User ID=nopuser;Password=xxxxxxxxxx;" }
3. Modify NopObjectContext.cs
   public NopObjectContext() :
    this(new DbContextOptionsBuilder().UseSqlServer(new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build().GetConnectionString("nopCommerce")).Options)
{

}
4. Add-Migration InitialMigrations
5. Remove all create/drop table code, just leave the Up and Down methods empty.
6. Update-Database