You do this in IIS. If you are using IIS 7, you can add a header to your web.config. Its in the system.webServer section.
<staticContent>
<clientCache httpExpires="Sun, 29 Mar 2020 00:00:00 GMT" cacheControlMode="UseExpires" />
</staticContent>
, HTTP-, 2020 . , ASP.NET, , script .
, :
<staticContent>
<clientCache cacheControlMaxAge ="2.00:00:00" cacheControlMode="UseMaxAge" />
</staticContent>
, HTTP-, 2 .