Shopping cart problem

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Hi all!!

I am trying to make my first shopping cart. i googled about it and found some useful articles. now the cart is working fine but there is one problem. if i have added for example Cell phone to my cart and then i again add Cell phone it shows it has two different item in the cart when there is only one with quantity 2. how can i solve this problem ??

private void Cart()
{
   DataTable MyDT = new DataTable();
   DataRow MyRow;

   if (ViewState["DataTable"] == null)
   {
      MyDT.Columns.Add("Productid",System.Type.GetType("System.Int32"));
      MyDT.Columns.Add("ProductName");
      MyDT.Columns.Add("UnitPrice", System.Type.GetType("System.Decimal"));

      MyRow = MyDT.NewRow();

      MyRow[0] = MyDT.Rows.Count + 1;
      MyRow[1] = DropDownList1.SelectedItem.Text;
      MyRow[2] = DropDownList1.SelectedItem.Value;

      MyDT.Rows.Add(MyRow);

   }
   else
   {
      MyDT = (DataTable)ViewState["DataTable"];

      MyRow = MyDT.NewRow();

      MyRow[0] = MyDT.Rows.Count + 1;
      MyRow[1] = DropDownList1.SelectedItem.Text;
      MyRow[2] = DropDownList1.SelectedItem.Value;

      MyDT.Rows.Add(MyRow);
   }
   ViewState["DataTable"] = MyDT;
   GridView1.DataSource = MyDT;
   GridView1.DataBind();
}

Posted 16-Dec-11 7:05am

ujjwal uniyal

Updated 16-Dec-11 7:11am

Wendelius

v2

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Wendelius · Accepted Answer · 2011-12-16T07:17:00

Well in both cases you add a new row. If you want to modify an existing rows value yuo could use for example Select[^] method to first find if such product already exists in the datatable.

On the other hand having two separate rows isn't necessarily a bad thing. Each row represents a selection to the shopping cart so modifying the cart by adding and removing rows is very simple. If you want to show the amount of items in the cart grouped by product you can use for example LINQ to produce the result. For example, see: http://www.eggheadcafe.com/microsoft/Csharp/32180980/how-group-by-and-sum-values-in-datatable.aspx[^]