Error create gridview control "The server tag is not well formed"

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C#

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="WebApplicationGridDropDown._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

Welcome to ASP.NET!

To learn more about ASP.NET visit www.asp.net.

You can also find
title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN.

<asp:gridview id="gvProducts"autogeneratecolumns="False" emptydatatext="No data available." runat="server" DataKeyNames="ProductID" CssClass="GridViewStyle" OnRowEditing="gvProducts_RowEditing" DataSourceID="sqlDSProducts" OnRowCancelingEdit="gvProducts_RowCancelingEdit" onrowupdating="gvProducts_RowUpdating" onrowdatabound="gvProducts_RowDataBound"> <rowstyle cssclass="RowStyle"> <footerstyle cssclass="RowStyle"> <SelectedRowStyle CssClass="SelectedRowStyle" /> <HeaderStyle CssClass="HeaderStyle" /> <alternatingrowstyle cssclass="AltRowStyle"> <editrowstyle cssclass="EditRowStyle"> <columns> <asp:BoundField DataField="ProductID" HeaderText="Product ID" ReadOnly="true"> <HeaderStyle HorizontalAlign="Left" Width="100px"/> <asp:BoundField DataField="ProductNumber" HeaderText="Product Number" ReadOnly="true"> <HeaderStyle HorizontalAlign="Left" Width="150px"/> <asp:TemplateField headertext="Product Name"> <HeaderStyle HorizontalAlign="Left" Width="200px" /> <itemstyle horizontalalign="Left" width="200px"> <itemtemplate> <asp:Label ID="lblProduct" runat="server" Text='<%#Eval("ProductName")%>'> <edititemtemplate> <asp:TextBox id="txtProductName" text='<%# Eval("ProductName")%>' runat="server" Width="200px"/> <asp:TemplateField headertext="Sub Category"> <HeaderStyle HorizontalAlign="Left" Width="100px" /> <itemstyle horizontalalign="Left"> <itemtemplate> <asp:Label ID="lblSubcategory" runat="server" Text='<%#Eval("SubCategoryName")%>'> <edititemtemplate> <asp:DropDownList ID="ddlSubCategories" runat="server"> <asp:TemplateField headertext="Category"> <HeaderStyle HorizontalAlign="Left" Width="150px" /> <itemstyle horizontalalign="Left"> <itemtemplate> <asp:Label ID="lblCategory" runat="server" Text='<%#Eval("CategoryName")%>'> <edititemtemplate> <asp:DropDownList ID="ddlCategories" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlCategories_SelectedIndexChanged"> <asp:TemplateField headertext="Price"> <HeaderStyle HorizontalAlign="Right" Width="80" /> <itemstyle horizontalalign="Right" width="80"> <itemtemplate> <asp:Label ID="lblListPrice" runat="server" Text='<%#Eval("ListPrice","{0:c}")%>'> <edititemtemplate> <asp:TextBox id="txtListPrice" text='<%#Eval("ListPrice")%>' Width="80" runat="server"/> <asp:TemplateField> <itemtemplate> <asp:LinkButton ID="btnedit" runat="server" CommandName="Edit" Text="Edit"/> <edititemtemplate> <asp:LinkButton ID="btnupdate" runat="server" CommandName="Update" Text="Update" /> <asp:LinkButton ID="btncancel" runat="server" CommandName="Cancel" Text="Cancel"/>