public static void Main()
DateTime fecha_actual= new DateTime(day:26, month: 7, year: 2017, hour:18, minute:45, second: 0);
DateTime fecha_ingreso= new DateTime(day:25, month: 7, year: 2017, hour:16, minute:45, second: 0);
TimeSpan ts = fecha_actual - fecha_ingreso;
var differenceInDias = ts.Days;
var differenceInHours = ts.Hours;
var differenceInMinuntos = ts.Minutes;
Console.WriteLine(differenceInHours);