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I am trying to get POST data, but I'm having no luck. My code is below. When I click the form button nothing happens.

I expected at least my IDE to snap at `A.Ret()`, but nothing happens whatsoever.

###File Test.cs

using System.Web;
public class A
{
public static string ret() {
var c = HttpContext.Current;
var v = c.Request.QueryString; // <-- I can see get data in this
return c.Request.UserAgent.ToString();
return c.Request.UserHostAddress.ToString();
return "woot";
}
}

###File Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="aspnetCSone._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>

<body>
<form id="form1" runat="server" method="post" action="Default.aspx">
<input type=hidden name="AP" value="99" />
<input type=button value="Submit" />
<div>
<a id="aa">a</a>
<% = A.ret() %>
</div>
</form>
</body>
</html>

`c.Request["AP"]` will read posted values. Also you need to use a submit button to post the form:

<input type="submit" value="Submit" />

instead of

<input type=button value="Submit" />

I'm a little surprised that this question has been asked so many times before, but the most reuseable and friendly solution hasn't been documented.

I often have webpages using AngularJS, and when I click on a Save button, I'll "POST" this data back to my .aspx page or .ashx handler to save this back to the database. The data will be in the form of a JSON record.

On the server, to turn the raw posted data back into a C# class, here's what I would do.

First, define a C# class which will contain the posted data.

Supposing my webpage is posting JSON data like this:

{
"UserID" : 1,
"FirstName" : "Mike",
"LastName" : "Mike",
"Address1" : "10 Really Street",
"Address2" : "London"
}

Then I'd define a C# class like this...

public class JSONRequest
{
public int UserID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
}

(These classes can be nested, but the structure must match the format of the JSON data. So, if you're posting a JSON User record, with a list of Order records within it, your C# class should also contain a `List<>` of Order records.)

Now, in my .aspx.cs or .ashx file, I just need to do this, and leave JSON.Net to do the hard work...

protected void Page_Load(object sender, EventArgs e)
{
string jsonString = "";
HttpContext.Current.Request.InputStream.Position = 0;
using (StreamReader inputStream = new StreamReader(this.Request.InputStream))
{
jsonString = inputStream.ReadToEnd();
}
JSONRequest oneQuestion = JsonConvert.DeserializeObject<JSONRequest>(jsonString);

And that's it. You now have a `JSONRequest` class containing the various fields which were POSTed to your server.

Try using:

string ap = c.Request["AP"];

That reads from the cookies, form, query string or server variables.

Alternatively:

string ap = c.Request.Form["AP"];

to just read from the form's data.

The following is OK in HTML4, but not in XHTML. Check your editor.

<input type=button value="Submit" />

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