请帮我把下面asp语法改成asp.net,谢谢

Question

aa="http://"&Request.ServerVariables("server_name")&Request.ServerVariables("path_info")
 aa= mid(aa,1,len(aa)-18)
content=replace(content,aa,"")我改成这样不对：string  aa="http://"+Request.ServerVariables("server_name")+Request.ServerVariables("path_info");
 aa= mid(aa,1,len(aa)-18);content=content.Replace(aa,"");
编译器错误信息: CS0118: “System.Web.HttpRequest.ServerVariables”表示“属性”，此处应为“方法”

Answer 1

string  aa = "http://" + Request.ServerVariables["server_name"] + Request.ServerVariables["path_info"];
aa = aa.Substring(0, aa.Length-18);
content = content.Replace(aa, "");

Answer 2

string aa="http://" +  Request.ServerVariables["server_name"].ToString() + Request.ServerVariables["path_info"].ToString();
aa=aa.Substring(0,aa.Length-18);