public async Task <IActionResult> OnPostAsync() { if (!ModelState.IsValid) { return(Page()); } _db.Attach(Blog).State = EntityState.Modified; try { _db.Blogs.Update(Blog); await _db.SaveChangesAsync(); } catch (DbUpdateConcurrencyException) { throw new Exception($"Blog {Blog.Id} not found"); } return(RedirectToPage("./Index")); }