Formatting Data in a Gridview?

[seidel1]

Currently I run a PROC that populates my Gridview. I know how to format the column widths, fonts etc, and I did some formatting on a date field as follows:

<ItemTemplate>
<asp:Label ID="Label2" runat="server" Font-Names="Arial" Font-Size="9pt" Text='<%# Bind("EFFECTIVE_DATE", "{0:d}") %>'></asp:Label>
</ItemTemplate>

but how do I format a phone number 5555551212 into (555) 555-1212,

Similarly How do I format 2345.3321 into 2,345.33