string sBeginTime = ""; for(int i=0; i < BeginTime.Length; ++i) { if(char.IsNumber(BeginTime[i]) || BeginTime[i].ToString().Equals("-")) { sBeginTime += BeginTime[i].ToString(); } } string sEndTime = ""; for(int i=0; i < EndTime.Length; ++i) { if(char.IsNumber(EndTime[i]) || EndTime[i].ToString().Equals("-")) { sEndTime += EndTime[i].ToString(); } }