WalkHistory(repo.HEAD.Commit); // Walk history from HEAD
WalkHistory(repo.Branches["experimental"].Commit); // Walk history from branch


private void WalkHistory(Commit commit)
{
    Console.WriteLine("SHA: " + commit.SHA);
    Console.WriteLine("Committed on: " + commit.CommittedDate);
    Console.WriteLine("By: " + commit.Committer);

    if (commit.HasParents)
    {
        foreach(Commit parent in commit.Parent)
              WalkHistory(parent);
    }
}