Format currency in ItemTemplate

http://lawrence.ecorp.net/inet/samples/regexp-validate2.php ( Javascript function)

http://www.regexlib.com/DisplayPatterns.aspx (Regular Expression to validate)

decimal moneyvalue = your value;
string html = String.Format("Order Total: {0:C}", moneyvalue);
Console.WriteLine(html);

(C# String format code)

<%# Format((Convert.ToDouble(Eval("Quantity")) *  Convert.ToDouble(Eval("UnitCost"))),"c")%>

'<%#Format(Convert.ToDouble(Eval("netQty")*Eval("UnitCost")),"c") %>'

Thanks to both of you but neither suggestion has an effect.  Here is the code that surrounds this line.  It is in a gridview.

<Columns>
<asp:BoundField DataField="ProductID" HeaderText="Product ID"  ....
<asp:BoundField DataField="ModelNumber" HeaderText="Model Number" ....
<asp:BoundField DataField="ModelName" HeaderText="Model Name" ....
<asp:BoundField DataField="UnitCost" HeaderText="Unit Cost" DataFormatString="{0:c}" />        
<asp:TemplateField>
    <HeaderTemplate>Quantity</HeaderTemplate>
    <ItemTemplate>
      <asp:TextBox  runat="server" Text='<%# Bind("Quantity") %>' />
    </ItemTemplate>
</asp:TemplateField>    
       
<asp:TemplateField>
    <HeaderTemplate>Item&nbsp;Total</HeaderTemplate>
    <ItemTemplate>
       <%# (Convert.ToDouble(Eval("Quantity")) *  Convert.ToDouble(Eval("UnitCost")))%>
    </ItemTemplate>

</asp:TemplateField>                
<asp:TemplateField>
    <HeaderTemplate>Remove&nbsp;Item</HeaderTemplate>
    <ItemTemplate>
          <center>
            <asp:CheckBox id="Remove" runat="server" />
          </center>
    </ItemTemplate>
</asp:TemplateField>
</Columns>

What else should I do.