c# - How to find the exact time left -

i working on reminder app , have taken 2 properties 1 date in datetime format , time of type string .my problem not able exact hours , min , sec when user set reminder future date how subtract future time current time can exact hours , min , sec left. please me out

thank here model class

 private datetime _date=datetime.today.date;     public datetime date     {         { return _date; }         set         {                 timespan tp = value - datetime.now;                 if (tp.totaldays>0)                 {                     remainingdays = (int)tp.totaldays;                     //timespan ts = value- system.timespan.fromhours(time);                     //string.format("{0}:{1}", system.math.truncate(ts.totalhours).tostring(), ts.minutes.tostring());                      remaininghours = (int)tp.totalhours;                      remainingmin = (int)tp.minutes;                     remainingsec = (int)tp.seconds;                     setproperty(ref _date, value);                 }          }      }      private string _time = datetime.now.timeofday.tostring();     public string time     {         { return _time; }         set         { setproperty(ref _time, value); }     }      private int _remainingdays;     public int remainingdays     {         { return _remainingdays; }         set         {              setproperty(ref _remainingdays, value);         }      }      private int _remaininghours;     public int remaininghours     {         { return _remaininghours; }         set         {              setproperty(ref _remaininghours, value);         }      }      private int _remainingmin;     public int remainingmin     {         { return _remainingmin; }         set         {              setproperty(ref _remainingmin, value);         }      }      private int _remainingsec;     public int remainingsec     {         { return _remainingsec; }         set         {             setproperty(ref _remainingsec, value);         }     }    } 

} ui have show time left

  <stackpanel  orientation="horizontal" height="60" horizontalalignment="center" >                                  <textblock x:name="tbkremaningtime" fontsize="50"  >                                 <run text="{binding remaininghours}"/>                                 <run text=":"/>                                 <run text="{binding remainingmin}"/>                                 <run text=":"/>                                 <run text="{binding remainingsec}"/>                                 </textblock>                             </stackpanel> 

let's take step back. using property setter in untraditional way. consider client writes code:

var y = new yourobject(); console.writeline(y.date); // prints today's date y.date = new datetime(2015,1,1); console.writeline(y.date); // still prints today's date  (?!)   

setting y.date didn't change y.date @ all! mutated several other fields/properties. violates core property design principle properties "should seen smart fields", not mention principle of least surprise.

moreover, instead of getting timespan -- well-documented type describing interval between 2 dates -- forcing client use own, limited, methods same data.

instead, consider:

class yourobject {     public datetime date {get; set;}     public timespan timeuntildate     {         {return date - datetime.now;}     } } 

and let client use resultant timespan necessary.