My code works when a drop downlist triggers postback on my page but the ddl is used before the fileupload. How can I call postback when a file has been browsed and put into the file upload. Or how could I do this differently? Basically I want to stop the user submiting the information they have inputted on my page if they have not attached the file. This is why I im making the button invisible if the path is still present in the file upload. Any ideas would superb...thanks!
btnSubmit.Visible = false;
btnSubmit.Visible = true;