C#, post build step

I have this folder structure.
e:\my solution
e:\my solution\build
e:\my solution\project1
e:\my solution\project2
e:\my solution\project5

I would like each project to have a post build step that moves a copy of my dll-s to folder "my solution\build".
This script does not work
Copy $(TargetDir) $(SolutionDir)\build\
I have tried other variations.  Any suggestions?
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try this
Copy /y $(OutDir)*.* $(SolutionDir)build
Miguel OzSoftware EngineerCommented:
xcopy /R/Y $(TargetDir)$(TargetFileName) $(SolutionDir)\build

and make sure you build from the solution, not the individual project:

an alternative to avoid issue above would be:
xcopy /R/Y $(TargetDir)$(TargetFileName) $(ProjectDir)..\build


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