Reference a DLL in project C# but can access to all namaspace in DLL

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hi
i make a project in c# vs2019 and reference a dll (c#) in my project
but when try use some namespace in my project cant find
some namespace from some dll valid
anyone can help me for this ?

What I have tried:

i make a project in c# vs2019 and reference a dll (c#) in my project 
but when try use some namespace in my project cant find
some namespace from some dll valid
anyone can help me for this ?

Posted 27-Sep-20 5:20am

Member 13654266

Updated 27-Sep-20 7:38am

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Richard Andrew x64 27-Sep-20 11:21am

What language is the DLL written in?

Member 13654266 27-Sep-20 11:36am

dll lan is same c#
make a small soft and need access to this dll namaspace

Richard MacCutchan 27-Sep-20 11:22am

You need to provide more details. We cannot guess what code you have written.

Member 13654266 27-Sep-20 11:38am

only need access to all namespace in this dll

Richard MacCutchan 27-Sep-20 11:50am

Please read my previous comment again. We have no idea what namespaces you are referring to, what namespaces are defined in your dll, what code you are trying to use ...

Richard Andrew x64 27-Sep-20 11:41am

Are the namespaces in the DLL marked "public"?

Member 13654266 27-Sep-20 12:03pm

public namaspace

Richard Andrew x64 27-Sep-20 12:10pm

What is the exact error message that you receive?

Member 13654266 27-Sep-20 12:16pm

the type or namespace name does not exist

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OriginalGriff · Answer 1 · 2020-09-27T07:38:00

Adding a reference to each project in your solution is only part of it : once the reference is there then you may want to add a using block to each, just as you do for dot NET namespaces.
Hover the mouse over the red underline error indicator and use the drop down that appears to help you solve this.
I use a lot of separate assemblies in my projects, and have never had a problem accessing public classes from namespaces within them.

Reference a DLL in project C# but can access to all namaspace in DLL

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Reference a DLL in project C# but can access to all namaspace in DLL

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