Problem with namespace

What should be the reference to choose? Thanks

Show the screenshot of your References in Solution Explorer.
Also send the Default.aspx.designer.cs page.

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" 
            runat="server"></asp:TextBox>
        </ASPP:PopupWindow>
        <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" 
                runat="server"></asp:TextBox>
                <asp:Button ID="in" runat="server" Text="sss" />
                <asp:TextBox ID="TextBox2" AutoPostBack="true" 
                runat="server"></asp:TextBox>
            </div>
        </ASPP:PopupWindow>
    </PopupWindow>
</ASPP:PopupPanel>

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to the Web-page, I then got the problem. Why?

Before this, everything is fine.

it's not aspp but asp you shouldn't mix classic asp with asp.net

It is ASP.NET, right?

Thanks.

I've added that dll file into Reference of the project like
https://app.box.com/s/j808pqjlhgtfl5qvlzf8g6y2gmg6ii4d

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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why?

Have you added a reference in the project ?

Currently your app.box.com link is not accessible for me.  What you have sent ?

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.

Is it possible for you to share your project sample ?

Can I have your email address? Thanks.

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 app.box.com  and send a link.

Can you please refer to this

https://app.box.com/s/2orckj9zohsq8xpn55ukx098u429r243

? Thanks

Hi,

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