Answer by Giulio Vian for Detect TFS Build vs. Visual Studio build

You do not need to edit the CSProj file: just use CMD.EXE syntax in Visual Studio Post-Build events

You can test if running inside Visual Studio

IF "$(BuildingInsideVisualStudio)"=="true" (…)

or inside TFS Build (2013 or later)

IF "$(TF_BUILD)"=="True" (…)

See the discussion aTFS 2010 Build Automation and post-build event and Team Foundation Build environment variables.