using System;
public class Program
{
public static void Main()
TimeSpan tsA = new TimeSpan(10,0,0);
DateTime dtA = DateTime.Parse("2020-01-01 09:00:00");
DateTime dtB = DateTime.Parse("2020-01-01 09:00:00");
//dtB.Date.Add(tsA);
if(tsA >= dtA.TimeOfDay)
//Console.Write("hello");
}
Console.WriteLine(tsA.ToString());
Console.WriteLine(dtB.ToString());