private void dgvPhieuMuon_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
 {
     try
     {
         if (checkOverTime == false)
         {
             resetleftform();
         }
         idPhieuMuon     = int.Parse(dgvPhieuMuon.Rows[e.RowIndex].Cells[3].Value.ToString());
         dtNgayMuon.Text = dgvPhieuMuon.Rows[e.RowIndex].Cells[5].Value.ToString();
         dtHanTra.Text   = dgvPhieuMuon.Rows[e.RowIndex].Cells[1].Value.ToString();
         dtNgayTra.Text  = dgvPhieuMuon.Rows[e.RowIndex].Cells[6].Value.ToString();
         if (dgvPhieuMuon.Rows[e.RowIndex].Cells[8].Value.ToString().Equals("True"))
         {
             cbTinhTrang.Text = "Đã trả";
         }
         else
         {
             cbTinhTrang.Text = "Chưa trả";
         }
         cbDocGia.SelectedValue     = dgvPhieuMuon.Rows[e.RowIndex].Cells[2].Value;
         cbThuThu.SelectedValue     = dgvPhieuMuon.Rows[e.RowIndex].Cells[4].Value;
         btnSuaPhieuMuon.Enabled    = true;
         btnLuuPhieuMuon.Enabled    = true;
         btnHuyPhieuMuon.Enabled    = true;
         btnXoaPhieuMuon.Enabled    = true;
         dgvChiTietMuon.DataSource  = client.listAllRentDetail(idPhieuMuon);
         txtMaPhieu.Text            = idPhieuMuon.ToString();
         btnThemChiTietMuon.Enabled = true;
         resetrightform();
         sumBook = client.countQuantityBookBorrowed(idPhieuMuon);
     }
     catch (Exception)
     {
         MessageBox.Show("Click chuột sai vị trí", "Lỗi", MessageBoxButtons.OK);
     }
 }