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if (IsNew != source.IsNew) IsNew = source.IsNew; if (IsSavable != source.IsSavable) IsSavable = source.IsSavable; if (IsValid != source.IsValid) IsValid = source.IsValid; It only updates its own property value if that value differs from the business object s value. This is because setting the control s property value raises a PropertyChanged event from the control, and that will likely cause some other UI control to refresh based on a trigger or control-to-control data binding. The end result is that you can create a control in the UI to display the status of the object. For example, here s a CheckBox control bound to the IsSavable property: <CheckBox IsEnabled="False" IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=csla:ObjectStatus, AncestorLevel=1}, Path=IsSavable}">IsSavable</CheckBox> The binding expression is quite complex, but the end result is that the control displays the current value of the IsSavable property for the business object referred to by the DataContext. At this point, you should have an understanding of the support provided for WPF data binding within CSLA .NET. The last technology I ll cover is Web Forms, which is the simplest from a data binding perspective.

For historical reasons, many native libraries use a mixture of error reporting strategies The Win32 API reports errors either via HRESULT values returned by functions or via error codes returned by the GetLastError API Many C++ class libraries use C++ exception handling instead NET also has a widely accepted exception handling infrastructure The CLR, the FCL, and third-party libraries use managed exceptions to report all kinds of errors The try..catch construct of C++/CLI can be used to handle C++ exceptions as well as managed exceptions Managed exceptions are tracking handles Any tracking handle referring to an object can be thrown as a managed exception The catch block shown here catches any managed exception: catch (Object^ o) { /* .. */ } However, to support language interoperability, the CLR, the FCL, and most other class libraries throw only exceptions of type System::Exception^ or tracking handles to classes derived from System::Exception.

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The workhorse of CopyData() is the GetField() method. This method retrieves the specified column property or field value from the source object. Given that the source object could be a simple or complex type, GetField() is relatively long: private static string GetField(object obj, string fieldName) { string result; DataRowView dataRowView = obj as DataRowView; if (dataRowView != null) { // this is a DataRowView from a DataView result = dataRowView[fieldName].ToString(); } else if (obj is ValueType && obj.GetType().IsPrimitive) { // this is a primitive value type result = obj.ToString(); } else { string tmp = obj as string; if (tmp != null) { // this is a simple string result = (string)obj; } else { // this is an object or Structure try { Type sourceType = obj.GetType(); // see if the field is a property PropertyInfo prop = sourceType.GetProperty(fieldName); if ((prop == null) || (!prop.CanRead)) { // no readable property of that name exists // check for a field FieldInfo field = sourceType.GetField(fieldName); if (field == null)

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