MainWindow.xaml

<Window x:Class="DragHandlerSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:dd="urn:gong-wpf-dragdrop"
        xmlns:local="clr-namespace:DragHandlerSample"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <Label Width="100" Height="50" BorderThickness="1" BorderBrush="Black" dd:DragDrop.IsDragSource="True" dd:DragDrop.DragHandler="{Binding CustomTextDragSource}">Text drag #1</Label>
        <Label Width="100" Height="50" BorderThickness="1" BorderBrush="Black" dd:DragDrop.IsDragSource="True" dd:DragDrop.DragHandler="{Binding CustomTextDragSource}">Text drag #2</Label>
        <Label Width="100" Height="50" BorderThickness="1" BorderBrush="Black" dd:DragDrop.IsDragSource="True" dd:DragDrop.DragHandler="{Binding CustomFileDragSource}">TextFile.txt</Label>
    </StackPanel>
</Window>