How do I get raw request body using ASP.NET 4.0 Web Form

Question

I'm trying to get the raw request body in ASP.NET 4.0 WebForm.
Request["param"], Request.Form["param"], Request.QueryString["param"] is not working.
Any idea of how to get this parameters?

// API POST Request with this Request Body (raw-json)
    {
      "name" : "Apple",
      "image" : "https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Red_Apple.jpg/265px-Red_Apple.jpg",
      "price" : 35
    }

// API Server trying to get request body.

// didn't work. empty
Request["name"]
// didn't work. empty
Request.Form["name"]
// didn't work. empty
Request.QueryString["name"]

Answer 1

You may use Request.InputStream

// include this in the top of your page to use JavaScriptSerializer and Hashtable
using System.Web.Script.Serialization;
using System.Collections;

...
using (var sr = new StreamReader(Request.InputStream))
{
    string body = sr.ReadToEnd();
    
    // Deserialize JSON to C# object
    // you can use some modern libs such as Newtonsoft JSON.NET instead as well
    JavaScriptSerializer serializer = new JavaScriptSerializer();
    Hashtable hashtable = serializer.Deserialize<Hashtable>(body);

    string name = hashtable["name"].ToString();
    string image = hashtable["image"].ToString();
    string price = hashtable["price"].ToString();

}