如何用DataGrid实现根据日期判断是否显示New标志

页面代码如下：

<asp:datagrid id="myGrid1" GridLines="None" PageSize="7" ShowHeader="False" AllowPaging="True"

CellPadding="0" AutoGenerateColumns="False" Height="100%" Width="224px" runat="server">

<ItemStyle Font-Size="12px" HorizontalAlign="Left" VerticalAlign="Middle"></ItemStyle>

<Columns>

<asp:HyperLinkColumn DataNavigateUrlField="ID" DataNavigateUrlFormatString="Detail.aspx?ID={0}"

DataTextField="Title"></asp:HyperLinkColumn>

<asp:TemplateColumn>

<ItemTemplate>

<img src='<%# (Convert.ToInt16(DataBinder.Eval(Container.DataItem,"DayCount"))<15)? "images/new.gif" :

"images/none.gif"%>' border="0" >

</ItemTemplate>

</asp:TemplateColumn>

</Columns>

<PagerStyle Visible="False"></PagerStyle>

</asp:datagrid>

后台代码：

SqlConnection con=new SqlConnection (ConfigurationSettings.AppSettings ["strconn"]);

con.Open ();

SqlCommand cmd=new SqlCommand ("select id,Title,datediff(day,sendDate,getdate()) as DayCount from NewInfo",con);

SqlDataAdapter da=new SqlDataAdapter(cmd);

DataSet ds=new DataSet ();

da.Fill (ds);

con.Close ();

myGrid1.DataBind();

//sendDate是一个DateTime类型的字段，是指发布日期