There are a lot of situations in Silverlight and WPF where you would like to get a list of items from a collection of a certain type. For example all textboxes in a Grid, or all customer records from a ListView. LINQ provides us with an extension method to do this very easily, the OfType<T>() extension on IEnumerable: public static IEnumerable<TResult> OfType<TResult>( this IEnumerable source ) Let me explain the use of this method thru some examples. Say you have a grid with some...