Dropping
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:
The instance of the listbox firing the event
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