private void button2_Click(object sender, EventArgs e) { try { BookLibraryEntities ctx = new BookLibraryEntities(); Book b = new Book(); b.ID = 1; ctx.Books.Attach(b); DbEntityEntry entry = ctx.Entry(b); var allProps = entry.CurrentValues.PropertyNames; entry.Property("ID").IsModified = false; entry.Property("Name").IsModified = false; entry.Property("Author").IsModified = false; entry.Property("Category").IsModified = false; entry.State = EntityState.Unchanged; b.Author = "My Updated Author2"; ctx.ChangeTracker.DetectChanges(); entry.Property("ID").IsModified = false; entry.Property("Name").IsModified = false; //entry.Property("Author").IsModified = false; entry.Property("Category").IsModified = false; //entry.Property("Author").IsModified = true; //entry.State = EntityState.Modified; ctx.SaveChanges(); } catch (System.Data.Entity.Validation.DbEntityValidationException ex) { } }
private void button1_Click(object sender, EventArgs e) { BookLibraryEntities ctx = new BookLibraryEntities(); ctx.SaveChanges(); //========================= }