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copied!<p>This is how I personally would approach something like this. Normally, I would move the members out into a separate logic class and include some other validation in the setters.</p> <pre><code>public partial class MainWindow : Window, INotifyPropertyChanged { public MainWindow() { InitializeComponent(); DataContext = this; } public DateTime Date { get { DateTime dt; if (DateTime.TryParseExact(String.Format("{0}-{1}-{2}", DateYear, DateMonth, DateDay), "yyyy-MM-dd", null, System.Globalization.DateTimeStyles.None, out dt)) return dt; return DateTime.MinValue; } } private string year = "2011"; public String DateYear { get { return year; } set { if (year == value) return; year = value; NotifyPropertyChanged("DateYear"); NotifyPropertyChanged("Date"); } } private string month = "11"; public String DateMonth { get { return month; } set { if (month == value) return; month = value; NotifyPropertyChanged("DateMonth"); NotifyPropertyChanged("Date"); } } private string day = "11"; public String DateDay { get { return day; } set { if (day == value) return; day = value; NotifyPropertyChanged("DateDay"); NotifyPropertyChanged("Date"); } } #region INotifyPropertyChanged public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(string info) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(info)); } #endregion } </code></pre> <p>And the xaml</p> <pre><code><Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Label>Date:</Label> <Label Grid.Column="1" Content="{Binding Path=Date}" /> <Label Grid.Row="1">Year</Label> <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding Path=DateYear}" /> <Label Grid.Row="2">Month</Label> <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Path=DateMonth}" /> <Label Grid.Row="3">Day</Label> <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding Path=DateDay}" /> </Grid> </Window> </code></pre>

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