//=======================================
        //  <Summary>
        //      Method for deleting book record
        //  </Summary>
        //=======================================
        private void DeleteBookRecord()
        {
            if (BookRecords.SelectedRows.Count > 0 && BookRecords.RowCount > 0)
            {
                string callNumber = BookRecords.CurrentRow.Cells[0].Value.ToString();

                DialogResult result = new DialogResult();
                result = MessageBox.Show("Are you sure to delete this record ?", "Warning", MessageBoxButtons.YesNoCancel);
                if (result == DialogResult.Yes)
                {
                    BooksController.DeleteBookRecord(callNumber);
                    GetBookRecords();
                }
            }
        }