protected void locationsFileUploaded(object sender, EventArgs e)
        {
            //upload the locations file
            string locationFileDescriptor = _absolutePath;

            if (locationsFileUpload.HasFile)
            {
                Session.Add("locationFileName", locationsFileUpload.PostedFile.FileName);
                locationFileDescriptor += locationsFileUpload.PostedFile.FileName;
            }

            _locationsInfo = _locNodes.getLocationsInfo(locationFileDescriptor);

            foreach (LocationInfo _locs in _locationsInfo)
            {
                //populate the drop down boxes with the values once locations are uploaded
                excludeLocationsNodes.Items.Add(new RadComboBoxItem(_locs._node._node));
                startLocationsList.Items.Add(new RadComboBoxItem(_locs._node._node));
                endLocationsList.Items.Add(new RadComboBoxItem(_locs._node._node));
            }
        }