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User cannot change the date value after its been saved. Why not?

Posted By:      Posted Date: September 07, 2010    Points: 0   Category :WPF
I've got a DatePicker control on a WPF 4.0 page (not a XBAP).  It's pulling data find out of our SQL Server database, but boy, if the user tries to change the data, forget it!  And for the life of me, I cannot figure out why not.  Here's the relevant XAML: <DatePicker Name="dpDateOfBirth" SelectedDateChanged="dpDateOfBirth_SelectedDateChanged" Validation.Error="dpDateOfBirth_Error" GotFocus="dpDateOfBirth_GotFocus"> <DatePicker.SelectedDate> <Binding Path="DateOfBirth" NotifyOnValidationError="True"> <Binding.ValidationRules> <ExceptionValidationRule></ExceptionValidationRule> </Binding.ValidationRules> <Binding.Converter> <local:DateConverter></local:DateConverter> </Binding.Converter> </Binding> </DatePicker.SelectedDate> </DatePicker> and here's my DateConverter class: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Data; using System.Windows; /* * This is the basic date converter, when no mask editing is involved. It just returns a date. */ namespace WpfRFS { [ValueConversion(typeof(DateTime), typeof(string))] public class DateConverter : IValueConverter { public object Convert(object value, Type targetT

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