private void GetSelectedValueDataGridViewBookTitle()
        {
            if (this.dgvBookTitle.SelectedCells.Count > 0 && this.dgvBookTitle.CurrentRow.Index < this.dgvBookTitle.Rows.Count - 1)
            {
                DataGridViewRow selectedRow = this.dgvBookTitle.Rows[this.dgvBookTitle.CurrentRow.Index];

                int id = Convert.ToInt32(selectedRow.Cells["clmnBookTitleId"].Value);
                string name = Convert.ToString(selectedRow.Cells["clmnBookTitleName"].Value);
                int bookTitleStatusId = Convert.ToInt32(selectedRow.Cells["clmnBookTitleStatusId"].Value.ToString());
                int publisherId = Convert.ToInt32(selectedRow.Cells["clmnPublisherId"].Value);
                int typeOfBookId = Convert.ToInt32(selectedRow.Cells["clmnTypeOfBookId"].Value);
                string summary = Convert.ToString(selectedRow.Cells["clmnSummary"].Value);

                this.lblInfor.Text = id.ToString() + " / " + name;
                this.txtBookName.Text = name;
                this.txtSummary.Text = summary;

                foreach (ComboboxItem item in this.cboBookTitleStatus.Items)
                {
                    if (Convert.ToInt32(item.Value) == bookTitleStatusId)
                        cboBookTitleStatus.SelectedItem = item;
                }
                foreach (ComboboxItem item in this.cboPublisher.Items)
                {
                    if (Convert.ToInt32(item.Value) == publisherId)
                        this.cboPublisher.SelectedItem = item;
                }
                foreach (ComboboxItem item in this.cboTypeOfBook.Items)
                {
                    if (Convert.ToInt32(item.Value) == typeOfBookId)
                        this.cboTypeOfBook.SelectedItem = item;
                }

                BookTitleBLL bookTitleBLL = new BookTitleBLL(id, bookTitleStatusId, publisherId, typeOfBookId, name, summary);
                List<AuthorBLL> authorList = bookTitleBLL.getAuthor();
                this.loadDataToDataGridViewAuthor(authorList);
                this.setSelectedValueComboboxAuthor(authorList[0]);
                this.setAmountOfBook(bookTitleBLL);

            }
            else
            {
                this.lblInfor.Text = "Id / Name";
                this.txtBookName.Text = "";
                this.cboBookTitleStatus.Text = this.cboBookTitleStatus.Items[0].ToString();
                this.cboPublisher.Text = this.cboPublisher.Items[0].ToString();
                this.cboTypeOfBook.Text = this.cboTypeOfBook.Items[0].ToString();
                this.cboAuthor.Text = this.cboAuthor.Items[0].ToString();
                this.txtBookTotal.Text = "";
                this.txtSummary.Text = "";
                this.dgvAuthor.Rows.Clear();
            }
        }