Forms/SellingForm.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using DGVPrinterHelper;
using System.IO;
namespace Vender
{
   
    public partial class SellingForm : Form
    {
        private string receiptName;
        int grandTotal = 0, n = 0,todayAmount=0;
        DBConnect dBCon = new DBConnect();
        DGVPrinter printer = new DGVPrinter();
        Boolean totalAmountAdd=false;
        public SellingForm()
        {
            InitializeComponent();
            bunifuFormDock1.SubscribeControlToDragEvents(panel1);
        }

        private void Print(string name,DataGridView grid)
        {

            printer.Title = name;
            printer.SubTitle = String.Format("Date : {0}", DateTime.Now);
            printer.SubTitleFormatFlags = StringFormatFlags.LineLimit | StringFormatFlags.NoClip;
            printer.PageNumbers = true;
            printer.PageNumberInHeader = false;
            printer.PorportionalColumns = true;
            printer.HeaderCellAlignment = StringAlignment.Near;
            printer.Footer = receiptName;
            printer.FooterSpacing = 15;
            printer.printDocument.DefaultPageSettings.Landscape = true;
            printer.PrintDataGridView(grid);
            
            
        }
        private void getCategory()
        {
            string selectQuery = "SELECT * FROM Category";
            SqlCommand cmd = new SqlCommand(selectQuery, dBCon.GetCon());
            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataTable table = new DataTable();
            adapter.Fill(table);
            CategoryDropdown.DataSource = table;
            CategoryDropdown.ValueMember = "Name";
            
        }

        private void getTable()
        {  
            string selectQuery = "SELECT Name,Price,Quantity FROM Product";