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The Add-Migration command in Entity Framework is used to generate a code file that represents changes to the database schema. It does not create the SQL Server database itself. To create the database, you should use the Database.EnsureCreated() or Database.Migrate() methods in your application code.

However, it is also worth noting that Entity Framework version 6 is not officially supported in ASP.NET Core 6.0. ASP.NET Core 6.0 uses .NET 6, which is a completely separate runtime from .NET Framework, which is required for Entity Framework 6.0. Therefore, using Entity Framework 6.0 in ASP.NET Core 6.0 may lead to unexpected behavior and is not recommended. Instead, consider using Entity Framework Core or upgrading to a newer version of Entity Framework.