Get changeset from workspace

gistfile1.cs

var localPath = "Some Path";

if (!Workstation.Current.IsMapped(localPath)) {
    Log.LogError(string.Format("The local path '{0}' is not mapped to a TFS workspace.", LocalPath));
    return false;
}
var info = Workstation.Current.GetLocalWorkspaceInfo(localPath);
var collection = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(info.ServerUri);
var workspace = info.GetWorkspace(collection);
var localVersions = workspace.GetLocalVersions(new [] {new ItemSpec(localPath, RecursionType.Full)}, false);
var changeset = localVersions[0].Max(v => v.Version);