Object reference not set to an instance of an object.

    <asp:SqlDataSource ID="SqlDataSource1? runat="server" ConnectionString=" ConnectionStrings:prdcts_accsrsConnectionString1" SelectCommand="SELECT [ProductID], [Name], [Description], [Price], [ImagePath] FROM [Products]">

</div>
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1" RepeatColumns="4"
    RepeatDirection="Horizontal">
    <itemstyle cssclass="box" />
   <itemtemplate>
     <div style="height:320px; width:220px; background:white; padding:30px 0 0 30px">
<table>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("ProductID") %>' Visible="false" >
        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%# Eval("ImagePath" , "~/products/Accessories/Images\\{0}") %>' PostBackUrl='<%# Eval("ProductID", "ProductDetails.aspx?ProductID={0}") %>' Height="170px" Width="180px" /><br /></td></tr>
     <asp:Label ID="ImageUrlLabel" runat="server" Text='<%# Eval("ImagePath",  "~/products/Accessories/Images\\{0}") %>' Visible="False"><br />
     <tr> <td class="td">    <asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>'><br /></td></tr>
      <tr> <td class="td">   <asp:Label ID="PriceLabel" runat="server" Text='<%# Eval("Price", "{0:##0.00}") %>'><br /></td></tr>
        <tr><td style="padding:15px 0 0 0">
 <div style="float:left">
     <asp:Button ID="Button1" runat="server" Text="Add To Cart" CssClass="bttn"
          onclick="Button1_Click"/> </div>
 <div style="float:right; padding-removed30px; margin-removed-10px">   <asp:ImageButton ID="ImageButton2" runat="server"  ImageUrl="~/products/TransparentHeart.png" Height="50px" Width="50px"/></div></td></tr>
</table>
</div>
    </itemtemplate>
<br />
<asp:HyperLink ID="CartLink" runat="server" NavigateUrl="~/UserCart.aspx">View Shopping Cart<br />
 <br />
<br />

public partial class Products_Accessories_Products : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        double Price = double.Parse(((Label)DataList1.Controls[0].FindControl("PriceLabel")).Text);
        string ProductName = ((Label)DataList1.Controls[0].FindControl("NameLabel")).Text;
        string ProductImageUrl = ((Label)DataList1.Controls[0].FindControl("ImageUrlLabel")).Text;
        int ProductID = int.Parse(((Label)DataList1.Controls[0].FindControl("ProductID")).Text);
        if (Profile.SCart == null)
        {
            Profile.SCart = new ShoppingCartExample.Cart();
        }
        Profile.SCart.Insert(ProductID, Price, 1, ProductName, ProductImageUrl);
        Server.Transfer("~/products/Accessories/Products.aspx");
    }
}

int ProductID = int.Parse(((Label)DataList1.Controls[0].FindControl("ProductID")).Text);