How to add dll in c project

Question

I am trying to add a  Science dll  in my project which should be staright forward  But I am getting a problem  Can someone tell me why   My C  project which I just copied from internet   using System  using System Collections Generic  using System Linq  using System Windows Forms  using System ComponentModel  using System Data  using Science Mathematics VectorCalculus     namespace using science dll       static class Program                    lt summary gt              The main entry point for the application               lt  summary gt  enter code here            C  Csharptutorial using science dll using science dll Program cs 7 7   error CS0246  The type or namespace name  Science  could not be found  are you missing a using directive or an assembly reference    Is it because I am using VS 2008   Science dll will run in the following frame  Net 4 0 and Visual C  2010 Express

User · Accepted Answer

The DLL must be present at all times - as the name indicates, a reference only tells VS that you're trying to use stuff from the DLL. In the project file, VS stores the actual path and file name of the referenced DLL. If you move or delete it, VS is not able to find it anymore.

I usually create a libs folder within my project's folder where I copy DLLs that are not installed to the GAC. Then, I actually add this folder to my project in VS (show hidden files in VS, then right-click and "Include in project"). I then reference the DLLs from the folder, so when checking into source control, the library is also checked in. This makes it much easier when more than one developer will have to change the project.

(Please make sure to set the build type to "none" and "don't copy to output folder" for the DLL in your project.)

PS: I use a German Visual Studio, so the captions I quoted may not exactly match the English version...

User · Answer

In the right hand column under your solution explorer  you can see next to the reference to  Science  its marked as a warning  Either that means it cant find it  or its objecting to it for some other reason  While this is the case and your code requires it  and its not just in the references list  it wont compile   Please post the warning message  we can try help you further

User · Answer

Have you added the dll into your project references list  If not right click on the project  References  folder and selecet  Add Reference  then use browse to locate your science dll  select it and click ok   edit  I can t see the image of your VS instance that some people are referring to and I note that you now say that it works in Net4 0 and VS2010   VS2008 projects support NET 3 5 by default  I expect that is the problem as your DLL may be NET 4 0 compliant but not NET 3 5

[c#] How to add dll in c# project

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