IsEmpty()

Returns true if the object or variable has no value.

if (Request["companyname"].()) {
       @:Company name is required.
 }

Request.Cookies[key]

Gets or sets the value of an HTTP cookie.

var
 cookieValue 
=
 
Request
.
Cookies
[
"myCookie"
].
Value
;

Server.HtmlDecode(htmlText)

Decodes a string that is HTML encoded.

var htmlDecoded = Server.("<html>");

Server.HtmlEncode(text)

Encodes a string for rendering in HTML markup.

var
 htmlEncoded 
=
 
Server
.
HtmlEncode
(
"<html>"
);