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Asked: 2026-06-06T06:10:46+00:00

Need to add two same name .csproj class libraries in my solution.Have two project

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Need to add two same name .csproj class libraries in my solution.Have two project but unfortunately those project class libraries names are same,like: Hello.csproj.I try to add existing project on solution then show me error

http://blogs.msdn.com/b/ansonh/archive/2006/09/27/774692.aspx
from above url I learned how to use same namespace dll on same project ,but I need help how to use same classlibraries on a solution

if have any query please ask,thanks in advanced.

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Note:ok people want to know the reason,i have two project on Autocat 2005 and 2010,now want to merge those project on one solution,2010 update base on 2005 so class libraries are same,but i need to use both of them.So problem arise and seeking help.

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1 Answer

  1. Editorial Team

    If you really must do this, then ensure the second project has a different name, and then change the namespaces of the classes in the second project (normally the project name comprises the first part of the namespace – just change that part). The classes will still be identical internally, but because they have a different namespace they will be distinct entities. This will lead to very smelly code though when you start mixing them up in the ClientApp – to avoid confusion make sure you always refer to them by their full namespace (i.e. do not have a using xyz.myclassname; statement at the top of the class file that uses them).

    Maybe you want to run two (almost identical) instances of the same service or something, but as mentioned it is hard to think of a genuine reason why you would need to do this. If you are looking to have two identical looking instances but different implementation then you will want to use interfaces instead.

    Edit: Visual Studio will not allow you to have two identically named projects, and you are playing crazy games if you change a project name but don’t change its project GUID (in the .proj file and the .sln file).

    The simplest thing for you to do here is to create a new empty project in the solution explorer, right click on it and Open folder in Explorer, then copy the class files from the original project to the new one, then back in the solution explorer choose Show all files (little button at the top of the solution explorer), then select the newly added files under the new project, right click, Add to project. (These menu options are from memory, they should be roughly right).

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