comparing dates/times between 2 forms

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how do I compare/validate 2 datetimePickers that are in different forms? eg.I have separate check in/out forms ,and I want to validate that a user not check out before checking in.

Posted 29-Jul-13 22:18pm

zikhona nkebe

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jackspero18 30-Jul-13 4:26am

Pass Check In value to next Form & compare it

Sushil Mate 30-Jul-13 4:27am

when user selects the check in date from check in form & opens the check out form you can pass the check in date from check in form, & assign that date to check out to datepicker. DateTimePicker.MinDate

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jackspero18 · Answer 1 · 2013-07-29T22:29:00

Solution 1

C#

checkout co= new checkout(datepicker);
            co.ShowDialog(this);

C#

public CheckOut(string k)
       {

           InitializeComponent();
           lbldate.Text= k;


       }

Posted 29-Jul-13 22:29pm

jackspero18

Updated 29-Jul-13 22:32pm

v2

lukeer · Answer 2 · 2013-07-29T22:49:00

Both forms are User Interface components. They shouldn't store information, just visualize (including the possibility to change) it. So both forms should target the same data set. Value range checks then belong to setters in the data model part:

C#

public class SomeTimeRelatedStuff
{
    private DateTime _checkInTime;
    private DateTime _checkOutTime;

    public DateTime CheckInTime
    {
        get { return(_checkInTime); }
        set { _checkInTime = value; }
    }

    public DateTime CheckOutTime
    {
        get { return(_checkOutTime); }
    }

    public bool SetCheckOutTime(DateTime checkOutTime)
    {
        if(checkOutTime < _checkInTime)
        {
            return(false);
        }

        _checkOutTime = checkOutTime;
        return(true);
    }
}

In your UI code, you then call SetCheckOutTime() with the value that user has entered. The return value tells you if that value has been accepted.

The nice part is that the checking is done in the data class. That class should know about its data and the relations that it has to have to its several parts. That helps keeping UI code clean of business logic.