A TFS policy that prevents users from checking in files that don't comply with your column limit coding style guidelines.
[Quick download] (https://github.com/gambitrex/tfspolicy-columnlimit/archive/master.zip) (Extract .zip then execute tfspolicy-columnlimit-master/ColumnLimitPolicy/Setup.ColumnLimitPolicy/bin/Release/Setup.ColumnLimitPolicy.vsix)
Take a look at Wiki for more details, including installation instructions.