title: the type or namespace name 'dll Name' could not be found (are you missing a using directive or an assembly reference?) asp.net 2.0
body: <p><a href="https://i.stack.imgur.com/6CIgp.png" rel="nofollow noreferrer">Error Image</a>I Have Asp.Net Website version 2.0 .My Project Contain Some dll File based Some Work.Its Work fine.I Search QRCode Generate Project and i get One project from <a href="http://www.aspsnippets.com/Articles/Dynamically-generate-and-display-QR-code-Image-in-ASPNet.aspx" rel="nofollow noreferrer">http://www.aspsnippets.com/Articles/Dynamically-generate-and-display-QR-code-Image-in-ASPNet.aspx</a> this link download this project and i open this project in VS2005 and Run it But i get Error 'the type or namespace name 'QRCode.dll' could not be found (are you missing a using directive or an assembly reference?)' and i leave it this project.After that Compile My all Web project i get same Error in all my Project.But dll name different QRCode.dll Replace my project dll.What happend and What Solution...thanks to all...</p>