Can't access image control defined in the HTML, in the code behind C# file

I'm busy with a project, and I'm trying to get an image to change when a button is clicked. The problem is that I cannot call the image control in the code section. How can I call the image control? I have tried adding the control to the designer.cs file but I cannot access the UI control, I have also tried many other ways but it hasn't solved the problem. ``` using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using INF3014F_BMW_TEAM16.Models; using System.Web.ModelBinding; namespace INF3014F_BMW_TEAM16 { public partial class ProductDetails : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } public IQueryable<Product> GetProduct( [QueryString("ProductID")] int? productId, [RouteData] string productName) { var _db = new INF3014F_BMW_TEAM16.Models.ProductContext(); IQueryable<Product> query = _db.Products; if (productId.HasValue && productId > 0) { query = query.Where(p => p.ProductID == productId); } else if (!String.IsNullOrEmpty(productName)) { query = query.Where(p => String.Compare(p.ProductName, productName) == 0); } else { query = null; } return query; } protected void RedBtn_Click(object sender, EventArgs e) { Image1.ImageUrl = "/Catalog/Images/1hacth3red.jpg"; } ``` ``` <asp:FormView ID="productDetail" runat="server" ItemType="INF3014F_BMW_TEAM16.Models.Product" SelectMethod ="GetProduct" RenderOuterTable="false" OnPageIndexChanging="productDetail_PageIndexChanging"> <ItemTemplate> <div> <h1><%#:Item.ProductName %></h1> </div> <br /> <table> <tr> <td> <Image id="Image1" src="/Catalog/Images/<%#:Item.ImagePatheWhite %>" style="border: solid; height: 300px" alt="<%#:Item.ProductName %>" runat ="server" /> </td> <td>&nbsp;</td> <td style="vertical-align: top; text-align:left;"> <b>Description:</b><br /><%#:Item.Description %><br /><span> <b>Price:</b>&nbsp;<%#: String.Format("{0:c}", Item.UnitPrice) %></span><br /><span> <b>Product Number:</b>&nbsp;<%#:Item.ProductID %></span><br /> <br /> <asp:Button ID="WhiteBtn" runat="server" Text="White" BackColor ="White" OnClick ="WhiteBtn_Click" /> <<asp:Button ID="BlackBtn" runat="server" Text="Black" BackColor ="Black" /> <asp:Button ID="RedBtn" runat="server" Text="Red" BackColor ="Red" OnClick ="RedBtn_Click" /> <br /> <a href="/AddToCart.aspx?productID=<%#:Item.ProductID %>"> <span class="ProductListItem"> <b>Add To Cart<b> </span> </a> <br /> </td> </tr> </table> </ItemTemplate> </asp:FormView> ```