gridview hyperlinkfield disable

Question

i created gridview lke this

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">

<Columns>

<asp:TemplateField>

<ItemTemplate>

<asp:CheckBox runat="server" />

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<ItemTemplate>

<span></span>

</ItemTemplate>

</asp:TemplateField>

<asp:HyperLinkField DataTextField="SimCardNo" HeaderText="SimCardNo" DataNavigateUrlFields="SimCardNo,SimCardPurchaseDate,ServiceProvider,ServicePlan" DataNavigateUrlFormatString="frmSimCard.aspx?SimCardNo={0}&SimCardPurchaseDate={1}&ServiceProvider={2}&ServicePlan={3}" />

<asp:BoundField DataField="SimCardPurchaseDate" HeaderText="SimCardPurchaseDate" />

<asp:BoundField DataField ="ServiceProvider" HeaderText="ServiceProvider" />

<asp:BoundField DataField="ServicePlan" HeaderText="ServicePlan" />

</Columns>

</asp:GridView>

 

my prob is all data loaded sucessfully ,but hyperlinkfield navigation not displayed(data is available)

hyperlinkfield

------------------

345

this data display like this 345 no navigation plz help me