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The Dropping server event fires just before a RadListBoxItem is dropped over an HTML element which has id attribute set. The event can be cancelled. It is not fired when you drop an item over another RadListBox/RadListBoxItem.

The event handler receives two parameters:

  1. The instance of the listbox firing the event

  2. An event arguments parameter containing the following properties:

  • HtmlElementID - the ID of the target element which the item is dropped over.

  • Cancel - set it to True to cancel the event and prevent the dropping

  • SourceDragItems - a collection of RadListBoxItems which are about to be dropped

protected void RadListBox_Dropping(object sender, RadListBoxDroppedEventArgs e)
    if (TextBox1.ClientID != e.HtmlElementID)
        e.Cancel = true;
Protected Sub RadListBox_Dropping(sender As Object, e As RadListBoxDroppedEventArgs)
    If TextBox1.ClientID <> e.HtmlElementID Then
        e.Cancel = True
    End If
End Sub 

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