private void InputDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string[] files = (string[]) e.Data.GetData(DataFormats.FileDrop);
if (files != null && files.Any())
{
var theFile = files[0];
((TextBox) sender).Text = File.ReadAllText(theFile);
}
}
}