How to query work items and their linked changesets in TFS

An option is to use the TFS API like the following snippet.

var projectCollection = new TfsTeamProjectCollection(
    new Uri("http://localhost:8080/tfs"),
    new UICredentialsProvider());
projectCollection.EnsureAuthenticated();
var workItemStore = projectCollection.GetService<WorkItemStore>();
var versionControlServer = projectCollection.GetService<VersionControlServer>();
var artifactProvider = versionControlServer.ArtifactProvider;
var project = workItemStore.Projects["Test01.MSFAgile.v5"];
var teamQueryFolder = project.QueryHierarchy["Team Queries"] as QueryFolder;
var query = teamQueryFolder["My Tasks"];
var queryDefinition = workItemStore.GetQueryDefinition(query.Id);
var variables = new Dictionary<string, string>
{
    {"project", query.Project.Name}
};
var workItemCollection = workItemStore.Query(
    queryDefinition.QueryText,
    variables);
foreach (WorkItem workItem in workItemCollection)
{
    Console.WriteLine("WI: {0}, Title: {1}", workItem.Id, workItem.Title);
    foreach (var changeset in
        workItem.Links
            .OfType<ExternalLink>()
            .Select(link => artifactProvider
                .GetChangeset(new Uri(link.LinkedArtifactUri))))
    {
        Console.WriteLine(
            "CS: {0}, Comment: {1}",
            changeset.ChangesetId,
            changeset.Comment);
    }
}