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How do I prevent users from using the same Name field and also alert them if they use Name1, Name2 .. NameN 

 

i.e 

 

If Project1, Project2 ... Project15 are already in use and the User is creating Project16 alert the user that similar names are already in use ( just alert and not object for using )

 

Can this be done using a validation rule or should this be a Visual force page
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