SqlConnection MyConnection = new SqlConnection("server=(local);database=bysj;Trusted_Connection=yes");
string DeleteCmd = "DELETE FROM ygwage WHERE ygid = @ygid AND wagedate BETWEEN @LowerDate AND @UpperDate";
//And dixin=@dixin";
SqlCommand MyCommand = new SqlCommand(DeleteCmd, MyConnection);
MyCommand.Parameters.Add("@ygid", SqlDbType.Int);