The type or namespace name could not be found

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The type or namespace name could not be found

What I have tried:

I added reference. Where is the error?
here is the error message

Posted 31-Dec-21 23:18pm

KenDzz

Updated 1-Jan-22 5:08am

PIEBALDconsult

v2

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OriginalGriff · Answer 1 · 2021-12-31T23:41:00

Solution 1

The error message means what it says - it doesn't know what the class name you used is.
If you've added the reference to the containing assembly, that isn't necessarily enough - you will probably also need a using statement at the top of each source code file.

Hover the mouse over the "red squiggly line" marked class name, and a little drop-down will appear to the left - open that and you will get options to help fix teh problem. Select "using xxx.xxx" and it will add the line you need for you.

Posted 31-Dec-21 23:41pm

OriginalGriff

Comments

KenDzz 1-Jan-22 6:30am

I can't fix the error your way. Can you give me your contact information? We can talk directly

OriginalGriff 1-Jan-22 6:40am

Nope. I already get hundreds of emails a day, and don't need any more! :laugh:

This is a public Q&A forum for a reason - so others with a similar problem can learn from it as well.

What - exactly - did you try, and what - exactly - happened?

KenDzz 1-Jan-22 7:19am

https://screencast-o-matic.com/watch/c3VVlXVoi3j
Here is a detailed video.

Adam Flow 1-Jan-22 7:34am

This looks like the usual Visual Studio hickup to me.
At 0:32 you clicked on the error entry and jumped to the code line for Sys_Users_SkillBooks.
It was underlined red for a second and then went fine.
Try to cleanup the solution, restart Visual Studio and rebuild your whole solution again.

I encounter this "phenomenon" too, occasionally. Especially when i switch between different solutions.

If you have Resharper installed, you can also do a Cache Cleanup.

OriginalGriff 1-Jan-22 7:42am

Your first error message refers to a file called "ActivateElf.cs" which isn't even open on your screen.
The one you follow goes to Skill.cs which doesn't include the using line (0:41 timeline)

As I said, "you will probably also need a using statement at the top of each source code file."

KenDzz 1-Jan-22 8:30am

Looks like you haven't watched my video carefully.I used Using. When I Build it gives the error "The type or namespace name could not be found". But when I click on the error file, it seems to have reloaded, the error is gone.
I made a new video to prove what I said
https://screencast-o-matic.com/watch/c3VVIZVoi0u

KenDzz 1-Jan-22 10:06am

I have fixed it. It seems that the solutions do not have the same .NET version