/// <summary>
        /// Calls function to insert contents of text boxes into database as Item
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            /*Take contents of txtCode, txtDescription, and txtCost and insert it into the
             * ItemDesc table.
             *
             * Error checking to make sure all boxes have input, all inputs are valid, and that
             * contents of txtCode does not already exist as a key in ItemDesc
             */
            try
            {
                if (txtCode.Text == "" || txtDescription.Text == "" || txtCost.Text == "")
                {
                    MessageBox.Show("Please enter text in all boxes.");
                }
                else
                {
                    bool valid = clsIL.addItem(txtCode.Text, txtDescription.Text, txtCost.Text);

                    if (!valid)
                    {
                        MessageBox.Show("Please enter unique item code and valid cost");
                    }
                    else
                    {
                        dgItems.ItemsSource = null;
                        dgItems.ItemsSource = clsIL.getItems();
                        txtCode.Text        = "";
                        txtDescription.Text = "";
                        txtCost.Text        = "";
                    }
                }
            }
            catch (Exception ex)
            {
                HandleError(MethodInfo.GetCurrentMethod().DeclaringType.Name,
                            MethodInfo.GetCurrentMethod().Name, ex.Message);
            }
        }
        /// <summary>
        /// Instantiates Item window
        /// </summary>
        /// <param name="main">Main window object</param>
        public wndItem(wndMain main)
        {
            try
            {
                InitializeComponent();
                mainWindow = main;
                clsIL      = new clsItemsLogic();

                dgItems.ItemsSource = clsIL.getItems();
            }
            catch (Exception ex)
            {
                HandleError(MethodInfo.GetCurrentMethod().DeclaringType.Name,
                            MethodInfo.GetCurrentMethod().Name, ex.Message);
            }
        }