I have a list of objects produced. after click on next I want to display the next product in the form

my products list:

Private List listProduct;

listProduits = new List<Product>(); 

Product objProduit_1 = new Produit; 

objProduct_1.ref = "001"; 
objProduct_1.article = "G900"; 
objProduct_1.quantity = 30; 

listProducts.Add(objProduct_1); 

ProductobjProduit_2 = new Product; 

objProduct_2.ref = "002"; 
objProduct_2.article = "G900"; 
objProduct_2.quantity = 35; 

listProduits.Add(objProduct_2); 

in my asp page I have the following form:

<form id="formNF" runat="server">

<asp:TextBox ID="txtRef" runat="server"></asp:TextBox>
<asp:TextBox ID="txtArticle" runat="server"></asp:TextBox>
<asp:TextBox ID="txtQauntity" runat="server"></asp:TextBox>


<asp:Button ID="ButtonNext" runat="server" Text="Next product" OnClick="ButtonNext_Click"/>
</form>

In my code-behind:

protected void ButtonNext_Click(object sender, EventArgs e)
{
    // I do not know how to retrieve the following product
    // How to stop and continue after click on next button?
    foreach (Product prd in listProduct){
        txtRef.Text = prd.ref;
        txtRef.Text = prd.article;
        txtRef.Text = prd.quantity;
    }
}

Thank you in advance.