private void btnAdd_Click(object sender, EventArgs e)
{
var adddetail = this.newdetail.Text;
var newDetail = new Room_Details();
newDetail.detail_name = adddetail;
db.Room_Details.Add(newDetail);
db.SaveChanges();
}
private void btnSave_Click(object sender, EventArgs e)
{
int roomNumber = Convert.ToInt32(this.cmbRNumber.Text);
int roomId = db.Rooms.Where(r => r.room_number == roomNumber).First().id;
int detailId = db.Room_Details.Where(d => d.detail_name == this.cmbRDetail.Text).First().id;
Room_Details rmdetails = new Room_Details();
rmdetails.id = roomId;
rmdetails.detail_name = detailId.ToString();
db.Room_Details.Add(rmdetails);
db.SaveChanges();
fillRoomDetail();
}