How to generate url for href in aspx page

Try using this, which maps to your website's root directory:

<a href="/Admin/AddVendor.aspx">Add Vendor</a>

EDIT : In that case, you could do this:

<a href="<%= Page.ResolveUrl("~/Admin/AddVendor.aspx") %>">Add Vendor</a>

It would be far easier to just use the asp.net Hyperlink control though

<asp:HyperLink ID="Link1" runat="server" NavigateUrl="~/Admin/AddVendor.aspx" Text="Add Vendor" />

runat server html control could map site directory

<a runat="server" href="~/Admin/AddVendor.aspx">Add Vendor</a>

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