I think the field "ActualRunTime" name is not defined.
Try one of this.
1.
string sqlreadRunTimeActual = "Select sum(ActualRunTime) ActualRunTime from MonthlyRunData " + "where Date = '16/11/2013'";
2.
(getRunTimeActual[0].ToString());
I am not sure if first field index is 0 or 1. I am guessing its 0.