How to assign href to anchor tag in .aspx C#

you will have to type the full address starts from http://

<a href="http://www.Test.com">Test</a>

from code behind:
add an Id attribute and runat="server" to the anchor tag as

<a id="anchorID"  runat="server">Test</a>

and the href can be assigned in code behind as

anchorID.Attributes["href"] = "http://www.Test.com";