How to update textbox value

I have a textbox in my View. I input a number into the textbox, and then i want the controller to multiply the number and put the result into the textbox.

How can I do that?

This is what i have done already. Let's start with the View:

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<dynamic>" %>

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

        <html xmlns="http://www.w3.org/1999/xhtml" >
            <head runat="server">
                <title>Index</title>
            </head>
            <body>
                <div>
                    <h2>Please enter a number</h2>

                    <% using (Html.BeginForm()) { %>

                        <%=Html.TextBox("number")%>

                        <input type="submit" value="Index" name ="Index" />

                    <% } %>
                </div>
            </body>
        </html>

As you can see I have a simple textbox and button.

This is my controller:

using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(int number)
        {
            number = number * 2;
            ViewData["number"] = number;
            return View(ViewData);
        }
    }
}

But nothing really happens. Yeah, I see the Post is being done, and the coded steps into public ActionResult Index(int number). I see that the number is taken from the textbox, it's multiplied correctly.

I've tried using ViewData as you can see. I've also used TempData. This is another code for the textbox in the View I've tried:

<%=Html.TextBox("number", ViewData["number"])%>

But it doesn't matter. The textbox doesn't get updated with the new value. How can I do that?

[HttpPost] public ActionResult Index(int number) { number = number * 2; ViewData["id"] = number; ModelState.Clear(); // this is the key, you could also just clear ModelState for the id field return View(ViewData); }

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How to update textbox value

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