Controls from placeholder cannot be accessed

Question

I have generated an ASP.NET C# website with the visual studio 2013 wizard in order to get the authentication code and add it to my web app.

I have copied all files and everything looks fine except one thing...

the RegisterExternalLogin.cs file gives me an error in my web, but in the generated sample it works and I don't know why.

This is the error:

RegisterExternalLogin.aspx.cs(65,17,65,25): error CS0103: The name 'userName' does not exist in the current context
RegisterExternalLogin.aspx.cs(82,55,82,63): error CS0103: The name 'userName' does not exist in the current context

Here is the RegisterExternalLogin.aspx

<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="RegisterExternalLogin.aspx.cs" Inherits="Account_RegisterExternalLogin" Async="true" %>

<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
    <h3>Register with your <%: ProviderName %> account</h3>

    <asp:PlaceHolder runat="server">
        <div class="form-horizontal">
            <h4>Association Form</h4>
            <hr />
            <asp:ValidationSummary runat="server" ShowModelStateErrors="true" CssClass="text-danger" />
            <p class="text-info">
                You've authenticated with <strong><%: ProviderName %></strong>. Please enter a user name below for the current site
                and click the Log in button.
            </p>

            <div class="form-group">
                <asp:Label runat="server" AssociatedControlID="userName" CssClass="col-md-2 control-label">User name</asp:Label>
                <div class="col-md-10">
                    <asp:TextBox runat="server" ID="userName" CssClass="form-control" />
                    <asp:RequiredFieldValidator runat="server" ControlToValidate="userName"
                        Display="Dynamic" CssClass="text-danger" ErrorMessage="User name is required" />
                    <asp:ModelErrorMessage runat="server" ModelStateKey="UserName" CssClass="text-danger" />
                </div>
            </div>

            <div class="form-group">
                <div class="col-md-offset-2 col-md-10">
                    <asp:Button runat="server" Text="Log in" CssClass="btn btn-default" OnClick="LogIn_Click" />
                </div>
            </div>
        </div>
    </asp:PlaceHolder>
</asp:Content>

and RegisterExternalLogin.aspx.cs

using Microsoft.AspNet.Identity;
using Microsoft.Owin.Security;
using System;
using System.Web;
using QuoteHD;

public partial class Account_RegisterExternalLogin : System.Web.UI.Page
{
    protected string ProviderName
    {
        get { return (string)ViewState["ProviderName"] ?? String.Empty; }
        private set { ViewState["ProviderName"] = value; }
    }

    protected string ProviderAccountKey
    {
        get { return (string)ViewState["ProviderAccountKey"] ?? String.Empty; }
        private set { ViewState["ProviderAccountKey"] = value; }
    }

    protected void Page_Load()
    {
        // Process the result from an auth provider in the request
        ProviderName = IdentityHelper.GetProviderNameFromRequest(Request);
        if (String.IsNullOrEmpty(ProviderName))
        {
            Response.Redirect("~/Account/Login");
        }
        if (!IsPostBack)
        {
            var manager = new UserManager();
            var loginInfo = Context.GetOwinContext().Authentication.GetExternalLoginInfo();
            if (loginInfo == null)
            {
                Response.Redirect("~/Account/Login");
            }
            var user = manager.Find(loginInfo.Login);
            if (user != null)
            {
                IdentityHelper.SignIn(manager, user, isPersistent: false);
                IdentityHelper.RedirectToReturnUrl(Request.QueryString["ReturnUrl"], Response);
            }
            else if (User.Identity.IsAuthenticated)
            {
                // Apply Xsrf check when linking
                var verifiedloginInfo = Context.GetOwinContext().Authentication.GetExternalLoginInfo(IdentityHelper.XsrfKey, User.Identity.GetUserId());
                if (verifiedloginInfo == null)
                {
                    Response.Redirect("~/Account/Login");
                }

                var result = manager.AddLogin(User.Identity.GetUserId(), verifiedloginInfo.Login);
                if (result.Succeeded)
                {
                    IdentityHelper.RedirectToReturnUrl(Request.QueryString["ReturnUrl"], Response);
                }
                else
                {
                    AddErrors(result);
                    return;
                }
            }
            else
            {
                userName.Text = loginInfo.DefaultUserName;
            }
        }
    }

    protected void LogIn_Click(object sender, EventArgs e)
    {
        CreateAndLoginUser();
    }

    private void CreateAndLoginUser()
    {
        if (!IsValid)
        {
            return;
        }
        var manager = new UserManager();
        var user = new ApplicationUser() { UserName = userName.Text };
        IdentityResult result = manager.Create(user);
        if (result.Succeeded)
        {
            var loginInfo = Context.GetOwinContext().Authentication.GetExternalLoginInfo();
            if (loginInfo == null)
            {
                Response.Redirect("~/Account/Login");
                return;
            }
            result = manager.AddLogin(user.Id, loginInfo.Login);
            if (result.Succeeded)
            {
                IdentityHelper.SignIn(manager, user, isPersistent: false);
                IdentityHelper.RedirectToReturnUrl(Request.QueryString["ReturnUrl"], Response);
                return;
            }
        }
        AddErrors(result);
    }

    private void AddErrors(IdentityResult result)
    {
        foreach (var error in result.Errors)
        {
            ModelState.AddModelError("", error);
        }
    }
}

Answer 1

I solved the problem...

I had to wrap the entire codebehind in a namespace

QuoteHD.Account
{
}