gridview,高手来看看

<asp:GridView ID="dgResult" runat="server"
AutoGenerateColumns="False" DataKeyNames="PKID" Width="100%"  onrwcommand="dgResult_RowCommand" >
<HeaderStyle HorizontalAlign="Center" />
<Columns>
<asp:TemplateField ItemStyle-HorizontalAlign="Center" HeaderStyle-Width="16">
<HeaderTemplate>
<input id="chkAll" onclick="CheckAll()" type="checkbox" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
<HeaderStyle Width="16px"></HeaderStyle>
<ItemStyle HorizontalAlign="Center"></ItemStyle>
</asp:TemplateField>

<asp:BoundField DataField="ProductsName" SortExpression="ProductName" HeaderText="产品名称"
ItemStyle-Width="320" ItemStyle-HorizontalAlign="center">
<ItemStyle HorizontalAlign="Center" Width="8%"></ItemStyle>
</asp:BoundField>
<asp:TemplateField HeaderText="图片" ItemStyle-Width="140">
<ItemTemplate>
<img src='../ProductsUrl/<%#Eval("ProductsUrl")%>' onerror="this.src='/images/nogoods120.gif'" width="140" height="140" />
</ItemTemplate>
<ItemStyle Width="50%"></ItemStyle>
</asp:TemplateField>
<asp:BoundField DataField="Productstime" SortExpression="Productstime" 
                HeaderText="发布时间" ItemStyle-Width="12%"
ItemStyle-HorizontalAlign="center">
</asp:BoundField>
<asp:BoundField DataField="Introduction" HeaderText="产品介绍"
ItemStyle-HorizontalAlign="center">
<ItemStyle HorizontalAlign="Center" Width="20%"></ItemStyle>
</asp:BoundField>
<asp:TemplateField ItemStyle-Width="5000px" ItemStyle-HorizontalAlign="center" HeaderText="相关操作">
<ItemTemplate>
<asp:HyperLink ID="btnModify" runat="server" NavigateUrl=''><img src="images/e17.gif" width="52" height="20" border="0" align="absmiddle"></asp:HyperLink>
<asp:ImageButton ID="btnDelete" runat="server" ImageAlign="AbsMiddle" ImageUrl="images/btnDelete.gif" CausesValidation="False"
CommandName="Remove" CommandArgument='<%#Eval("PKID") %>'
OnClientClick='<%#  "if (!confirm(\"你确定要删除" + Eval("PKID").ToString() + "吗?\")) return false;"%>'></asp:ImageButton>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" Width="10%"></ItemStyle>
</asp:TemplateField>
</Columns>
</asp:GridView>后台：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class Freasy_ProductsView : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            bind();
        }    }
    private void bind()
    {
        string sql = "select PKID,ProductsName,ProductsUrl,Productstime,Introduction,Productstype from Products";
        SqlCommand com = new SqlCommand(sql,DBHlepr.connection);
        SqlDataAdapter dr = new SqlDataAdapter(com);
        DataSet ds = new DataSet();
        dr.Fill(ds);
        dgResult.DataSource = ds;
        dgResult.DataKeyNames = new string[] { "PKID" };   
        dgResult.DataBind();
    }    protected void dgResult_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        int id =Convert.ToInt32(e.CommandArgument);
        if (e.CommandName == "Remove")
        {
            string ssql = "delete from Products where PKID='"+id+"'";
            SqlCommand com = new SqlCommand(ssql,DBHlepr.connection);
            DBHlepr.connection.Open();
            com.ExecuteNonQuery();
            DBHlepr.connection.Close();
            bind();
        }    }
}
为什么我删除不了，求解决