Problem with namespace

How to resolve these problems?
Error	15	The type or namespace name 'ASP' could not be found in the global namespace (are you missing an assembly reference?)	C:\App2\Start\Default.aspx.designer.cs	76	27	Start
Error	16	The type or namespace name 'ASP' could not be found in the global namespace (are you missing an assembly reference?)	C:\App2\Start\Default.aspx.designer.cs	85	27	Start
Error	17	The type or namespace name 'ASP' could not be found in the global namespace (are you missing an assembly reference?)	C:\App2\Start\Default.aspx.designer.cs	112	27	Start

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HuaMin ChenProblem resolverAsked:
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Manoj PatilSr. Software EngineerCommented:
Hey, what is your project build version ?
Show your .aspx file code.

If this error occurs, then the most common way to resolve it is adding a reference like below.

If you are using VS.NET:
1.  Right click on the References folder on your project.
2.  Select Add Reference.
3.  Select the .NET tab (or select the Browse button if it is not a .NET Framework assembly).
4.  Double-click the assembly containing the namespace in the error message.
5.  Press the OK button.
HuaMin ChenProblem resolverAuthor Commented:
What should be the reference to choose? Thanks
Manoj PatilSr. Software EngineerCommented:
Show the screenshot of your References in Solution Explorer.
Also send the Default.aspx.designer.cs page.
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HuaMin ChenProblem resolverAuthor Commented:
Sorry, after I added these
<ASPP:PopupPanel HeaderText="This is Header" ID="pup" 
          runat="server" OnCloseWindowClick="MycloseWindow">
    <PopupWindow runat="server">
        <ASPP:PopupWindow ID="PopupWindow1" 
        Visible="false" runat="server">
            <asp:Label ID="lbl" runat="server">ssssssssss</asp:Label>
            <br />
            <asp:TextBox ID="txt" AutoPostBack="true" 
        <ASPP:PopupWindow ID="PopupWindow2" runat="server">
            <div align="center" style="width: 500px; height: 300px">
                <asp:Label ID="Label1" runat="server">nnnnn</asp:Label>
                <br />
                <asp:TextBox ID="TextBox1" AutoPostBack="true" 
                <asp:Button ID="in" runat="server" Text="sss" />
                <asp:TextBox ID="TextBox2" AutoPostBack="true" 

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to the Web-page, I then got the problem. Why?
HuaMin ChenProblem resolverAuthor Commented:
Before this, everything is fine.
David Johnson, CD, MVPRetiredCommented:
it's not aspp but asp you shouldn't mix classic asp with
HuaMin ChenProblem resolverAuthor Commented:
It is ASP.NET, right?
Manoj PatilSr. Software EngineerCommented:
I think you are using third party control and forgot to add a reference.
Just add a attached DLL (uploaded as a .txt file. Just change the extension to .dll) in your project  and add a below line in your .aspx page

<%@ Register Assembly="ASP.Web.UI.PopupControl"  Namespace="ASP.Web.UI.PopupControl"   TagPrefix="ASPP" %>

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HuaMin ChenProblem resolverAuthor Commented:

I've added that dll file into Reference of the project like

but I've still got this

Server Error in '/Start3' Application.

Parser Error 
  Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

 Parser Error Message: Could not load file or assembly 'ASP.Web.UI.PopupControl' or one of its dependencies. The system cannot find the file specified.

Source Error: 

Line 1:  <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Start._Default" %>
Line 2:  <%@ Register Assembly="ASP.Web.UI.PopupControl" 
Line 3:      Namespace="ASP.Web.UI.PopupControl"
Line 4:      TagPrefix="ASPP" %>  

 Source File:  /Start3/Default.aspx    Line:  2 

Assembly Load Trace: The following information can be helpful to determine why the assembly 'ASP.Web.UI.PopupControl' could not be loaded.

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34249  

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Manoj PatilSr. Software EngineerCommented:
Have you added a reference in the project ?

Currently your link is not accessible for me.  What you have sent ?
HuaMin ChenProblem resolverAuthor Commented:
Here is the same file
In above, I did already added the DLL file but I'm still getting the problem after having done this.
Manoj PatilSr. Software EngineerCommented:
Is it possible for you to share your project sample ?
HuaMin ChenProblem resolverAuthor Commented:
Can I have your email address? Thanks.
Manoj PatilSr. Software EngineerCommented:
Its my pleasure to be in touch with you. But sharing an email addresses is not allowed here.
And I think, you can not send DLL files in mail
You upload it on  and send a link.
HuaMin ChenProblem resolverAuthor Commented:
Can you please refer to this

? Thanks
Manoj PatilSr. Software EngineerCommented:

I have seen your sample project. But I didn't get any error or warning.
It runs directly without any error.
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