Getting a FormatString threw an exception

[Rod]

I've placed a masked numeric input control onto a user control we're working on. When I run the app I get the following error:

System.Windows.Markup.XamlParseException occurred
  HResult=-2146233087
  Message='Set property 'Telerik.Windows.Controls.RadMaskedInputBase.FormatString' threw an exception.' Line number '291' and line position '48'.
  Source=PresentationFramework
  LineNumber=291
  LinePosition=48
  StackTrace:
       at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
  InnerException: System.FormatException
       HResult=-2146233033
       Message=Format specifier was invalid.

I'm sure I've done something wrong, but am not sure what. Here's what the XAML looks like right now:

<telerik:RadMaskedNumericInput x:Name="txtClientNumber" FormatString="D6" MinWidth="80" Margin="3,0"
                               VerticalContentAlignment="Center" FontSize="15"
                               Value="{Binding ClientNumber, UpdateSourceTrigger=PropertyChanged}" Mask="#6" />

What we're trying to do is have the user enter a 6 digit integer value. The data type is an int (in C#), and SQL Server data type is also an int. So, what's the error of my ways?

[Petar Mladenov]

Hi Rod,

FormatString determines the way you see the calue in the MaskedInput control when it is not focused.
For example, with FormatString = "{}{0:n1}"
The focused control will display 123456 and the unfocused: 123456.0
So I guess you nedd FormatString = "{}{0:n0}" which will display 123456 in both cases. One of your mistakes is the correct format of the string and the other is using D instead of N.
Additionaly, you may have to set AutoFillNumberGroupSeparators="False" to remove the separator.
Let us know if this moves you in the right direction.

Regards,
Petar Mladenov
Telerik