remove migration in asp.net core code example

Example 1: ef core delete all migrations

dotnet ef database drop -f -v
dotnet ef migrations add Initial
dotnet ef database update

Example 2: The migration '20200806160941_InitialMigration' has already been applied to the database. Revert it and try again. If the migration has been applied to other databases, consider reverting its changes using a new migration.

dotnet ef database update 0
dotnet ef migrations remove