}   //End Of Insert Function

        public static void InsertData(InvoiceInfoClass stock)
        {
            string query = "INSERT INTO InvoiceTable (CustomerName, InvoiceNumber, Date ) VALUES('" + stock.CustomerName.ToUpper() + "','" + stock.Invoice + "','" + stock.Date + "' );";

            try
            {
                DataTable _dtable = null;

                _dtable = dbAccess.ReadDataFromDb(query);
            }
            catch (Exception ex)
            { throw ex; }
        }   //End Of Insert Function
        private void button1_Click_1(object sender, EventArgs e)
        {
            InvoiceInfoClass fs = new InvoiceInfoClass();

            try
            {
                fs.CustomerName = customerNameTextbox.Text.Trim();
                fs.Invoice      = Convert.ToInt32(invoiceTextBox.Text.Trim());
                fs.Date         = Convert.ToInt32(dateTextBox.Text.Trim());
                // QueryClass.InsertData(fs);
                MessageBox.Show("Add Successfully");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error", ex.Message);
            }
        }