asp.net mvc simple question

I'm creating asp.net mvc login page. This is simple. Same as others. Controller contains 2 method.

My problem is

I'm debugging First LogOn method. ReturnUrl has value. for example "Admin/Index". After debuggin Second LogOn method. But ReturnUrl is Null.

public ActionResult LogOn(string ReturnUrl) // First method
{
    return View();
}

[HttpPost]        
public ActionResult LogOn(string eUserName, string ePassword, Boolean rememberMe, string ReturnUrl) //Second Method
{
 ...
}

My View is here>>

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage" %>
<!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"&gt;
<head id="Head1" runat="server">
<title>Login</title>    
</head>
<body>
<table style="width: 100%">
            <tr>
                <td align="center">
                    <div style="width: 800px;">
                        <%=Html.ValidationSummary() %>
                    </div>
                </td>
            </tr>
            <tr>
               <td align="center">
                 <% Html.RenderPartial("LoginControl"); %>
               </td>
            </tr>
    </table>
</body>
</html>

Logincontrol

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<div style="text-align: left; width:150px;margin-top:20px;">
    <% using (Html.BeginForm("Logon", "Account", FormMethod.Post))
       { %>

    <div>
        Хэрэглэгчийн нэр:</div>
    <div>
        <%= Html.TextBox("eUserName") %>
    </div>
    <div style="margin-top:5px;">
        Нууц үг:</div>
    <div >
        <%= Html.Password("ePassword") %>
    </div>
    <div style="margin-top:5px;">
        <%= Html.CheckBox("rememberMe") %>
        <label class="inline" for="rememberMe">
            Намайг сана?</label>
    </div>
    <div style="text-align:center;margin-top:5px;">
        <input type="submit" value="Нэвтрэх" />
    </div>


    <%} %>
</div>

Why ReturnUrl returns null?

What happening?

EDIT

Thanks Tim Roberts

Last correct code is here>>

<% using (Html.BeginForm("Logon", "Account",new { ReturnUrl = HttpContext.Current.Request.QueryString["returnUrl"]} FormMethod.Post)){ %>

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <div style="text-align: left; width:150px;margin-top:20px;"> <% using (Html.BeginForm("Logon", "Account", new { ReturnUrl = HttpContext.Current.Request.RawUrl }, FormMethod.Post)) { %> ... as before <% } %> </div>

ansaurus

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asp.net mvc simple question

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