Drag and Drop, help please

[HaLo2FrEeEk]

I've got a program that requires that the user pick a file or folder on their computer. Currently the user clicks Open Single in the File menu and an openFileDialog comes up; to open a folder the user clicks Batch from the File menu and an folderBrowserDialog comes up. I'd like to expand this to allow the user to simply drag a file or folder onto the program window, and I'm realizing how complicated drag n drop can be.

I'm starting by just testing folders. I've set up an event handler for the dragEnter and dragLeave events. When I drag a folder over the form the dragOver event handler confirms that the data being dragged is actually a folder and returns either true or false. The dragLeave handler then displays all the files in that folder when I let go of the mouse. The problem here is that while letting go of the mouse completes the drag and drop, so does dragging my mouse outside the form's bounds. I need a way to confirm that the data was actually dropped onto the form.

I've tried the DragDrop event, but it doesn't seem to do anything. I tried this simple code:

private void Form1_DragDrop(object sender, DragEventArgs e)
{
    MessageBox.Show("Data was dropped");
}

then I tried dropping something onto the form. Nothing happened. I didn't get a messagebox, nothing.

So how can I get the program to only process the information if the data was actually dropped onto the form, and not if it was dragged onto then out of the form?

[Christian Binder]

@HaLo2FrEeEk
Did you set the Form's Property AllowDrop?

[Curtis Rutland]

@HaLo2FrEeEk
I actually wrote an article here on this site about this:

http://bytes.com/topic/net/insights/...-c-net-program

[HaLo2FrEeEk]

Ergh, I actually ended up figuring it out, I would like to take a look at that link though, thanks!