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In EF Core, you can indicate the name of your database by passing the name to the DbContext constructor or by setting it in the OnConfiguring method of your DbContext class. Here's an example of setting the database name in the constructor:

public class MyDbContext : DbContext
{
    public MyDbContext(DbContextOptions<MyDbContext> options) : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // configure your entity mappings here
    }
}

To specify the database name, you can pass it to the base constructor like this:

public MyDbContext(DbContextOptions<MyDbContext> options) : base(options)
{
}

// specify the database name in the OnConfiguring method
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=MyDbName;Trusted_Connection=True;");
}

In this example, we've specified "MyDbName" as the name of the database.

Alternatively, you can specify the database name directly in the DbContext constructor like this:

public MyDbContext() : base("name=MyDbName")
{
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    // configure your entity mappings here
}

In this case, we're passing the connection string name "MyDbName" to the base constructor. The actual connection string will be defined in your app.config or web.config file.