The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly

Question

Hi, I am trying to convert a .NET website called iqworks.com to a .NET web application called iqworksWebApp.
I created  iqworksWebApp as a web application and copied the folders from a folder called iqworks.com (that’s to folder name). it builds ok, but when I try to run it I get this error message :

 

I added system.data.linq to my references, but I still get the message?

 

Thanks for any suggestions or advice

Answer 1

Hi @iqworks Information Quality Works

First of all I think you can delete this reference and add it again, since you are a copied project, you can't rule out the problem that the file reference is corrupted or the location is different.

Secondly, it is important that your original project is in the same version as your current project.

Finally, you can try to add this reference to the web.config file, but usually this is a problem to resolve multiple version conflicts.

Best regards,
Qi You

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.