what is the problem whit this Command ?

Question

cmd.CommandText="UPDATE CompTav SET "+ @"TeorBohen='"+RbTeorBohen.Text +"' "+ @"TechName='"+tbTech.Text +"' "+ @"TipolDate='"+dt1.ToShortDateString()+"' "+ @"TipolStartHour='"+dt2.ToShortTimeString()+"' "+ @"Statos='"+CbStatos.Text +", "+ "where CartisNum=" +lbCartisNum.Text; why this command dont work ?