Assembly: System.Windows.Controls.Data (in System.Windows.Controls.Data.dll)
The default implementation attempts to cast the owning cell content to TextBlock or TextBox. If these casts succeed, then the implementation returns the Text value. Next, the owning column is cast as DataGridBoundColumn. If this cast succeeds, the implementation returns a string value or string name of the cell based on the evaluated data binding context. Otherwise, the implementation calls base.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.