This is windows Forms application and I have datagridview on it, in this datagridview I need to group all Same Items together and count it.

this is the full code

namespace POS
{
    public partial class frmpos : Form
    {
        CoffeeShopDatabaseEntities1 csde = new CoffeeShopDatabaseEntities1();
        BindingList<TblProduct> products = new BindingList<TblProduct>();
        
        public frmpos()
        {
            InitializeComponent();

            dgvProductsChosen.DataSource = products;
            

            CreateTabbedPanel();

            AddProductsToTabbedPanel();

        }

        private void AddProductsToTabbedPanel()
        {
            int i = 1;

            tabControl1.SizeMode = TabSizeMode.Fixed;
            tabControl1.ItemSize = new Size(100, 75);
            foreach (TabPage tp in tabControl1.TabPages)
            {
                
                ObjectQuery<TblProduct> filteredProduct = new ObjectQuery<TblProduct>("SELECT VALUE P FROM TblProducts AS P Where P.ProductType = " + i.ToString(),csde);

                FlowLayoutPanel flp = new FlowLayoutPanel();
                flp.Dock = DockStyle.Fill;

                foreach (TblProduct tprod in filteredProduct)
                {
                    Button b = new Button();
                    b.Size = new Size(90, 90);
                    b.Text = tprod.Description;
                    b.Tag = tprod;
                    b.Click += new EventHandler(UpdateProductDataGridView);
                    flp.Controls.Add(b);
                }

                tp.Controls.Add(flp);
                
                i++;
            }
        }

         private void CreateTabbedPanel()
        {
            foreach (TblProductType pt in csde.TblProductTypes)
            {
                tabControl1.TabPages.Add(pt.ProductType.ToString(), pt.Description);
            }
        }

         void UpdateProductDataGridView(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            TblProduct p = (TblProduct)b.Tag;

                      
            products.Add(p);
        }       
    }
}

This is windows Forms application and I have datagridview on it, in this datagridview I need to group all Same Items together and count it.

My datagridview now looks like as this photo;