How do I know if the solution has been modified?

I would like to make a code, which when executed, would know if the solution was changed and which project has changed, but I do not know if there is a method to take as a basis. Then I would like your help.

There is a .Net class that is used to monitor changes to the file system:

• FileSystemWatcher

With it you can make the following code to be notified whenever a file changes:

// Criar uma instância do FileSystemWatcher e configurá-la.

var watcher = new FileSystemWatcher(

    "C:MinhaSolucao", // caminho raiz da solução a ser monitorada