static public void SaveAndCloseProducts() { if (db != null) { db.SaveChanges(); db.Dispose(); db = null; } }
static public void SaveAndCloseEmployees() { if (db != null) { db.SaveChanges(); db.Dispose(); db = null; } }
static public void SaveAndCloseSuppliers() { if (db != null) { db.SaveChanges(); db.Dispose(); db = null; } }