asp.net "could not load type" error

Four possible solutions:

• Most likely cause: .dll is not in the correct \bin folder.
   Check the Project Properties page(Build panel), the \bin folder MUST be located under the website's root folder. There are scenarios -depending on how and when you created your web form- where the \bin folder of the form may not be the same as the \bin folder of the web site.


• Check the code-behind file and confirm the namespace and the class match the aspx page header. If you cut-n-paste the new page files from an existing page this is usually the case.


• Clean the project and rebuild it


• Punt: close VS then restart it, rebuild again and ... keep your fingers crossed