Checking For Text Data When Doing Drag And Drop?

I'm doing drag and drop from a list view. In my starting list view's ItemDrag event handler, I say (amomgst other things):

data.SetFileDropList(coll)
data.SetText(CurrentFolder, TextDataFormat.Text)
sender.DoDragDrop(data, DragDropEffects.Copy Or DragDropEffects.Move)

CurrentFolder being a string that holds the name of the folder represented by the list view. In the target control's DragDrop event handler, CType(e.Data, DataObject).GetText evaluates to what CurrentFolder was when ItemDrag was executed.But: e.Data.GetDataPresent(TextDataFormat.Text) always evaluates to FALSE.If I replace "TextDataFormat.Text" by "DataFormats.Text" (in both places) the result is the same. I am asking this although my code does what I want, because I feel that I should not call CType(e.Data, DataObject).GetText before I have established that TextData is actually present. So how do I properly check for the presence of the text data.