Servervariable in C#

Hello buddies,
I am tring to get a value from ServerVariable using following code.
but it is giving me error like this
System.Web.HttpRequest.ServerVariables' denotes a 'property' where a 'method' was expected
Mu code is as follows :

string strVariable;
strVariable = HttpContext.Current.Request.ServerVariables("HTTP_REFERER");

if (Page.IsPostBack ==false)
{
Session["LastPage"] = Request.ServerVariables("HTTP_REFERER");
}

can anybodt help me out

thanks & regards

pankaj

Code:

---

string strVariable;
strVariable = HttpContext.Current.Request.ServerVariables["HTTP_REFERER"];

if (Page.IsPostBack ==false)
{
Session["LastPage"] = Request.ServerVariables["HTTP_REFERER"];
}

---

thanks sixfeetsix , i have done it already