Retrieving all values from POST in asp.net

Here is the code:

<%@ Page Language="C#" CodeFile="~/listen.aspx.cs" Inherits="listenerTest.listen" %>
<%
Response.ClearContent();
Response.ClearHeaders();
Response.Clear();
Response.AddHeader("Content-Type", "text/plain");

if (Request.Form.Count != 0)
{
string all = "";
foreach (string name in Request.Form.AllKeys)
{
string value = Request.Form[name];
// Do something with (name, value).
all += "key:" + name + "value:" + value;
}
}

Response.End();
%>