public void RetrieveAccount()
{
ColumnSet columns = new ColumnSet("name", "accountratingcode", "createdon", "_parentaccountid_value");
Entity account = new Entity("account")
{
["name"] = "JT Test Retrieve",
["parentaccountid"] = new EntityReference("account", new Guid("ACA19CDD-88DF-E311-B8E5-6C3BE5A8B200"))
};
Guid id = client.Create(account);
Entity retrieveAccount = client.RetrieveAsync("account", id, columns).Result;
}