private bool GetAndUpdateDocuments()
{
    // Create an instance of the Tree provider first
    TreeProvider tree = new TreeProvider(CMSContext.CurrentUser);

    // Prepare parameters
    string siteName = CMSContext.CurrentSiteName;
    string aliasPath = "/API-Example/%";
    string culture = "en-us";
    bool combineWithDefaultCulture = false;
    string classNames = "CMS.MenuItem";
    string where = null;
    string orderBy = null;
    int maxRelativeLevel = -1;
    bool selectOnlyPublished = false;

    // Fill dataset with documents
    DataSet documents = DocumentHelper.GetDocuments(siteName, aliasPath, culture, combineWithDefaultCulture, classNames, where, orderBy, maxRelativeLevel, selectOnlyPublished, tree);

    if (!DataHelper.DataSourceIsEmpty(documents))
    {
        // Create a new Version manager instance
        VersionManager manager = VersionManager.GetInstance(tree);

        // Loop through all documents
        foreach (DataRow documentRow in documents.Tables[0].Rows)
        {
            // Create a new Tree node from the data row
            TreeNode editDocument = TreeNode.New(documentRow, "CMS.MenuItem", tree);

            // Check out the document
            manager.CheckOut(editDocument);

            string newName = editDocument.DocumentName.ToLower();

            // Change document data
            editDocument.DocumentName = newName;

            // Change coupled data
            editDocument.SetValue("MenuItemName", newName);

            // Save the changes
            DocumentHelper.UpdateDocument(editDocument, tree);

            // Check in the document
            manager.CheckIn(editDocument, null, null);
        }

        return true;
    }

    return false;
}