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I Binged and Googled because there should be people outta there that have done this before, but nothing appeared of relevancy to my problem ,so i thought lets play with the binding behvaior

Null ), however setting this did not change a thing it still worked fine as before however the above message was printed in my debugger and i had the idea that it was actually slower as before ( because of the prints in the immediate window ofcourse as this slows the IDE ) BindingExpression:Path=Stand DataItem=’mErrorListing’ (HashCode=30844487) target element is ‘CheckBox’ (Name=”) target property is ‘IsChecked’ (type ‘Nullable`1’) InvalidCastException:’System.InvalidCastException: Null object cannot be converted to a value type at (Object value, Type conversionType, IFormatProvider provider at MS.(Object o, Type type, Object parameter, CultureInfo culture) at .ConvertHelper(IValueConverter converter, Object value, Type targetType, Object parameter, CultureInfo culture)'”Īt first glance and after some Googling / Binging 🙂 i thought this was because my checkbox did not have the IsThreeState=”True” field set wich makes known to the WPF engine that we are dealing with a checkbox with three states True, False or NotSet ( Nothing a.k. “ Error: 6 : ‘SystemConvertConverter’ converter failed to convert value ‘’ (type ‘’) fallback value will be used, if available.

Īfter this change i noticed that my client app was actually slower ( huh ? ), a quick look in the inmediate window showed the following message I am currently bussy with a project where i move a lot of data, some of this data is contained in bit fields in my database and i represent this in the UI with a checkbox in a datagrid everything worked fine untill i had a lightbulb moment the app gets its data through a WCF service, so i thought if the bit field is false i could better send a Nothing pointer ( NULL for sharpies ) as the XML would be a lot smaller ( a null is represented by not writing the tags in XML ) and thus my transfers should be faster so i changed the boolean fields in my Models to nullable booleans.