Partial spacific property update in ef or single property or one property or spacific

[HttpPost]
public async Task<ActionResult> update_nominee(custreg_working d, string id)
{

    using (var context = new db_context())
    {
        d.cust_id = id;
        context.Configuration.ValidateOnSaveEnabled = false;
        context.custreg_working.Attach(d);
        System.Data.Entity.Infrastructure.DbEntityEntry<custreg_working> entry = context.Entry(d);

        entry.Property(e => e.Nominee).IsModified = true;
        entry.Property(e => e.Relation).IsModified = true;
        entry.Property(e => e.nmob).IsModified = true;

        await context.SaveChangesAsync();
    }
    return RedirectToAction("edit", new { id = d.cust_id });
}