Dynamics 365 CE (CRM) Web API update existing data

d365_webapi_update_record.cs

public void Update(string entityLogicalName, Guid id, object updateContent)
{
    string apiBaseUrl = $"{_d365Url}/api/data/v9.1";
    string apiFullUrl = $"{apiBaseUrl}/{entityLogicalName}s({id.ToString()})";

    using (HttpClient httpClient = new HttpClient())
    {
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _accessToken);
        httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpRequestMessage request = new HttpRequestMessage(new HttpMethod("PATCH"), apiFullUrl);
        request.Content = new StringContent(JsonConvert.SerializeObject(updateContent), Encoding.UTF8, "application/json");

        var response = httpClient.SendAsync(request).GetAwaiter().GetResult();
        var content = response.Content.ReadAsStringAsync();

        if (!response.IsSuccessStatusCode)
        {
            throw new CrmHttpResponseException(response.Content);
        }
    }
}