在C#代码里给sql查入null值

很好的一种方法:

cmdText = string.Format("insert into Integrals (integralsName,integral,invail,starttime, endtime, integraltype)values('{0}',{1},{2},{3},{4},{5})", Integrals.Name, Integrals.integral, Integrals.invail, @"null", @"null", Integrals.integraltype);