private void LoadData()
        {
            switch (TypeOfSearch)
            {
            case 0: this.Text = "Book Title"; break;

            case 1: this.Text = "Author"; break;

            case 2: this.Text = "Category"; break;

            case 3: this.Text = "User"; break;

            case 4: this.Text = "Book"; break;

            case 5: this.Text = "Inventory"; break;
            }
            switch (TypeOfSearch)
            {
            case 0:
                BUS.BookTitleBUS bkTitle = new BUS.BookTitleBUS();
                //BUS._MultiTableBUS bus = new BUS._MultiTableBUS();
                bsItem.DataSource = bkTitle.GetAllBookTitleByDataSet();
                //bsItem.DataSource = bus.SelectBookTitleWithTitleOrAuthorNameOrCategoryName("", "", "");
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                this.dgvSearch.Columns["AuthorID"].Visible   = true;
                this.dgvSearch.Columns["CategoryID"].Visible = true;
                break;

            case 1:
                BUS.AuthorBUS author = new BUS.AuthorBUS();
                bsItem.DataSource        = author.GetAllAuthorByDataSet();
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                break;

            case 2:
                BUS.CategoryBUS cate = new BUS.CategoryBUS();
                bsItem.DataSource        = cate.getAllCategoryByDataSet();
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                break;

            case 3:
                BUS.UserBUS user = new BUS.UserBUS();
                bsItem.DataSource        = user.getAllUserByDataSet();
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                break;

            case 4:
                BUS.BookBUS bk = new BUS.BookBUS();
                bsItem.DataSource        = bk.getAllBookIDByDataSet();
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                break;

            case 5:
                BUS.InventoryBUS inven = new BUS.InventoryBUS();
                bsItem.DataSource        = inven.getAllInventoryByDataSet();
                dgvSearch.DataSource     = bsItem;
                bnItemList.BindingSource = bsItem;
                break;
            }

            int width = 0;

            foreach (DataGridViewColumn col in dgvSearch.Columns)
            {
                width += col.Width;
            }
            width += dgvSearch.RowHeadersWidth;

            dgvSearch.ClientSize = new Size(width + 2, dgvSearch.ClientSize.Height);

            if (this.Role == 1 && this.TypeOfSearch != 4 && this.TypeOfSearch != 0 && this.TypeOfSearch != 5)
            {
                btnNew.Enabled    = false;
                btnDelete.Enabled = false;
            }
        }