ASP.NET error with Assembly

Question

Hello I am creating an ASP.NET/C# website and I want to use the Ajax Toolkit assembly. I added it to the "References".

In Default.aspx I have this:

<%@ Page Title="My_Website" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" ViewStateMode="Enabled" CodeBehind="Default.aspx.cs" Inherits="My-Website._Default" %>  <%@ Register TagPrefix="ajaxToolkit" Namespace="AjaxControlToolkit" Assembly= "AjaxControlToolkit"%> <asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"> </asp:Content> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <ajaxToolkit:ComboBox ID="ComboBox1" runat="server" /> </asp:Content> 

In the Design Tab I can see the Combo box and everything is fine. But when I try to debug the application I get this error:

Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "AjaxControlToolkit.Properties.Resources.NET4.resources" was correctly embedded or linked into assembly "AjaxControlToolkit" at compile time, or that all the satellite assemblies required are loadable and fully signed.

Answer 1

I had the same error message while ago and it was caused due to missing ScriptManager. Try to add ScriptManager to your aspx page.

<asp:ScriptManager runat="server"></asp:ScriptManager> 

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Or you can add ScriptManager dynamically at Page_Load event of code behind.

if (ScriptManager.GetCurrent(Page) == null) {      Page.Form.Controls.AddAt(0, new ScriptManager()); } 

If you want to learn why we need ScriptManager when ASP.NET AJAX ToolKit is used you can check here.