Entity Framework - Update without Select

delete-with-select.cs

var id = 1;
using (var db = new entityContext())
{
	// Select entity
	var entity = db.dbset.FirstOrDefault(e => e.ID == id);
	if (entity != null)
	{
		// Remove Entity
		db.dbset.Remove(entity);
		db.SaveChanges();
	}
}

delete-without-select.cs

var id = 1;
using (var db = new entityContext())
{
	// Create stub entity
	var entity = new myEntity { ID = id };

	// Attach the entity to the context.
	db.dbset.Attach(entity);

	// Remove the entity. This marks it for deletion
	db.dbset.Remove(entity);
	
	// Save changes. EF will see that the entity state has changed,
	// and process it accordingly. In this case performing a delete query.
	db.SaveChanges();
}

update-without-select.cs

try
{
	using (var db = new dbContext())
	{
		// Create new stub with correct id and attach to context.
		var entity = new myEntity { PageID = pageid };
		db.Pages.Attach(entity);

		// Now the entity is being tracked by EF, update required properties.
		entity.Title = "new title";
		entity.Url = "new-url";
		
		// EF knows only to update the propeties specified above.
		db.SaveChanges();
	}
}
catch (DataException)
{
	// process exception
}