Soup Shop Inventory Management System using C#.net

string name;
int price = 0;
int qty;
int tot = 0;

if (chksoup.Checked)
    {
      name = "Chicken Soup";
      qty = int.Parse(txtcsoup.Text);
      price = 100;
      tot = qty * price;
      this.dataGridView1.Rows.Add(name, qty, price, tot);
     }
if (chkveg.Checked)
    {
      name = "Vegitable Soup";
      qty = int.Parse(txtvsoup.Text);
      price = 50;
      tot = qty * price;
      this.dataGridView1.Rows.Add(name, qty, price, tot);
    }

    int sum = 0;
    for (int row = 0; row < dataGridView1.Rows.Count; row++)
        {
           sum = sum + Convert.ToInt32(dataGridView1.Rows[row].Cells[3].Value);
         }

            txttot.Text = sum.ToString();
    }

i have attached the video link below. which will do this tutorials step by step.