I have a project named project1 in VS in a solution called Solution 'ShopEntry'. I want to have a copy of the project1 as project2 within the same solution. How can I do it without having errors.

thankx in advance

Hmm, shouldn't it work if you copy the project folder, rename the folder (but not the project files) and then add it as an existing project? You should be able to do this and rename the newly-added project afterwards.