ASP.NET Substring

[Tahir]

hi,
i am programming a website using ASP.NET 2.0 and SQL 2005 and serving the
last five members via DataList containing a HyperLink like this code:
<asp:HyperLink ID="firmaHyperLink" runat="server" NavigateUrl='<%#
Eval("firmId", "~/Firma.aspx?firmId={0}") %>' Text='<%# Eval("name", "{0}")
%>' ></asp:HyperLink>
i have a problem that "name" variable may be too long so how can i substring
it? very glad if a sample code :)