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QuestionHow to Import and Export Excel File in ASP.NET MVC? Pin
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QuestionSending Email using ASP.NET(MVC) SMTP Pin
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QuestionWhy can't I Publish web site error warn ? Pin
Member 24584676-Aug-19 22:33
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AnswerRe: Why can't I Publish web site error warn ? Pin
jkirkerx8-Aug-19 14:15
professionaljkirkerx8-Aug-19 14:15 
You posted this question on many websites.

It means that "webapp4U.UI.Controls.Controls_MenuLeft" web user control exists twice.
Here and here ...

c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\nhadat\42a77785\d1e96df3\App_Web_danhmucbds.ascx.cc671b29.dll

c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\nhadat\42a77785\d1e96df3\App_Web_quangcaoleft.ascx.cc671b29.dll

You can try and go to the folder and delete the 2 files and rebuild the project. See if that clears up the error.

But I have found far in the past that this user control probably exists in 2 spots in your project. In other words you have somehow duplicated the same control in the same project. Try and locate the first instance of the control, then locate the 2nd. Or rename the first instance and rebuild to see what happens.

Newer versions of VS does a better job of detecting these mistakes, and sort of forces you to use namespaces to keep code tidy. In my experience the older VS versions let a few things slip by, until you deploy and learn the hard way.
If it ain't broke don't fix it
Discover my world at jkirkerx.com

AnswerRe: Why can't I Publish web site error warn ? Pin
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