Add to cart :Getting Details from from one page (Datalist) to another page(gridview)

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C#

ASP.NET

Please Please Help me with this . I have been working in the shopping cart project and displayed product details in datalist like
Product Name
Price Quantity
product Description
and the next Page is Add cart page if i click the add to cart button the values in productdetails should be binded in the gridview in the next page i tried some coding but it doesnt work it doesnt binded any values .please help me to solve this problem.
coding as follows
View productDetails.aspx.cs page

  protected void use(object sender, DataListItemEventArgs e)
    {
       Label prd = (Label)e.Item.FindControl("productNameLabel");
     ViewState["productName"] = prd.Text;
      Label des = (Label)e.Item.FindControl("Label1");
      ViewState["description"] = des.Text;
      Image img = (Image)e.Item.FindControl("Image1");
      ViewState["image"] = img.ImageUrl.ToString();
      Label prc = (Label)e.Item.FindControl("priceLabel");
      ViewState["price"] = prc.Text;
}

protected void Button1_Click(object sender, EventArgs e)
    {
        int i = int.Parse(TextBox1.Text);


        int p = int.Parse((string)ViewState["price"]);
        string img = ViewState["image"].ToString();
        string s2 = System.Web.HttpContext.Current.User.Identity.Name;
        string s1 = ViewState["productName"].ToString();
        con.Open();
        string cartCmd = "insert into completeCart(pName,quantity,uName,img,price) values('" + s1 + "','" + i + "','" + s2 + "','" + img + "','" + p + "') ";
        SqlCommand cmd = new SqlCommand(cartCmd, con);
        cmd.ExecuteNonQuery();
        con.Close();

        Response.Redirect("Add_cart.aspx?user=" + s2);

    }

Add to cart aspx.cs

public partial class Add_cart : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("Data Source=ADMIN-PC\\SQLEXPRESS;Integrated Security=true;Initial Catalog=rsaProducts");
    string url;
    decimal grandTotal = 0;
 
    protected void Page_Load(object sender, EventArgs e)
    {
        BindGridData();
        string s2 = System.Web.HttpContext.Current.User.Identity.Name;
        Response.Cookies["uname"].Value = s2;
    }
    protected void GridView1_RowDeleted(object sender, GridViewDeletedEventArgs e)
    {

    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        BindGridData();
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                decimal rowTotal = Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "price")) * Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "quantity"));
                grandTotal = grandTotal + rowTotal;


            }
            Response.Cookies["price"].Value = grandTotal.ToString();
            TextBox2.Text = grandTotal.ToString();
            HyperLink1.ImageUrl = "~/img/str/buttons/checkout.jpg";
    }
    private void BindGridData()
    {
        try
        {
            con.Open();
            string productid = Request.QueryString["id"].ToString();
            {
                string sql = "select * from completeCart where id=" + productid;
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataAdapter da = new SqlDataAdapter(sql, con);
                DataSet ds = new DataSet();
                da.Fill(ds);
                GridView1.DataSource = ds;
                GridView1.DataBind();
            }
        }

        catch (Exception ex)
        {
        }
        finally
        {
            con.Close();
        }
    }
}

add to cart.aspx page

<asp:GridView ID="GridView1" CssClass="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="id"
EmptyDataText="No Item in the Cart"
onrowdatabound="GridView1_RowDataBound"
onrowdeleted="GridView1_RowDeleted"
BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px"
CellPadding="3" CellSpacing="2">
<rowstyle forecolor="#8C4510" backcolor="#FFF7E7">
<columns> <asp:CommandField ShowDeleteButton="True" />
<asp:BoundField DataField="pName" HeaderText="PRODUCT" SortExpression="pName" />
<asp:TemplateField HeaderText="img" SortExpression="img">
<edititemtemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("img") %>'>

<itemtemplate>
<asp:Image ID="Image1" runat="server" Width="250px" Height="300px" ImageUrl='<%# Bind("img") %>' />


<asp:BoundField DataField="quantity" HeaderText="QUANTITY"
SortExpression="quantity" />
<asp:BoundField DataField="price" HeaderText="COST" SortExpression="price" />
<footerstyle backcolor="#F7DFB5" forecolor="#8C4510">
<pagerstyle forecolor="#8C4510" horizontalalign="Center">
<SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<sortedascendingcellstyle backcolor="#FFF1D4">
<sortedascendingheaderstyle backcolor="#B95C30">
<sorteddescendingcellstyle backcolor="#F1E5CE">
<sorteddescendingheaderstyle backcolor="#93451F">



<!-- PayPal Logo -->

<img src="https://www.paypal.com/en_US/i/bnr/horizontal_solution_PPeCheck.gif" border="0" alt="Solution Graphics">

<!-- PayPal Logo -->




please help me to solve this problem