What is the solution for “The Type or namespace &#

问题:

 Error 3 The type or namespace name 'AjaxControlToolkit' could not be found
 in the global namespace (are you missing an assembly reference?)   
 D:\My App\table\PopUpdata.aspx.designer.cs 58 27 table.

I have Declared this javascript but what is the problem.

<%@ Page Title="Show Data From Menu" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="PopUpdata.aspx.cs" Inherits="table.PopUpdata" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

回答1:

Way to reference a dll is:

1. In Solution Explorer, select the project.
2. On the Project menu, click Add Reference. The Add Reference dialog box opens.
3. Select the tab indicating the type of component you want to reference. (If you don't find your .dll in the list, then go to the browse tab and find it in your directory)

An article on MSDN to include installed libraries.

an There is another way to do it.

回答2:

To have the needed references for AjaxControlToolkit

Right Click project/solution > Manage NuGet Packages..>install Ajax control Toolkit.

This will add needed assemblies to your solution.

回答3:

I have faced the same issue. I have deleted all the files from the bin folder and then added the files back to the folder. It worked successfully. Hope it resolves your issue.

回答4:

You're missing an assembly reference. So you need to reference AjaxControlToolkit.dll in your project.

回答5:

This is general issue of dll

for solving this you must have 3 dll in your Bin folder

1--AjaxControlToolkit.dll

2--AjaxControlToolkit.dll.refresh (Refresh file)

3--AjaxControlToolkit (Program Debug database)

Now just add the AjaxControlToolkit.dll refrence in your application.