Drag Drop 'OfType' error

[Brett]

public class ScheduleViewDragDropBehavior : Telerik.Windows.Controls.ScheduleViewDragDropBehavior

    {

        public override IEnumerable<IOccurrence> ConvertDraggedData(object data)

        {

            if (DataObjectHelper.GetDataPresent(data, typeof(Appointment), false))

            {

                return ((IEnumerable)DataObjectHelper.GetData(data, typeof(Appointment), false)).OfType<IOccurrence>();

            }

            return base.ConvertDraggedData(data);

        }

    }

The following line of code is giving me an error:

return ((IEnumerable)DataObjectHelper.GetData(data, typeof(Appointment), false)).OfType<IOccurrence>();

This is the error:
System.Collections.IEnumerable does not contain a definition for 'OfType' and no extension method 'OfType' accepting a first argument of type 'System.Collections.IEnumerable' could be found (are you missing a using directive or an assembly reference?) C:\BRPlanner\BRP\Planner\ScheduleViewDragDropBehavior.cs 24 98 Planner

What do I need to do to create an extension method for 'OfTYpe'

Thank you.

[Yana]

Hi Brett,

You just need to add the following namespace:

using System.Linq;

Hope this helps.

Greetings,
Yana
the Telerik team