VkNet.VkApi.GetApiUrl C# (CSharp) Method

        public string GetApiUrl(string methodName, IDictionary<string, string> parameters, bool skipAuthorization = false)
        {
            var builder = new StringBuilder($"https://api.vk.com/method/{methodName}?");

            foreach (var pair in parameters)
            {
                builder.Append($"{pair.Key}={pair.Value}&");
            }

            if (skipAuthorization && parameters.Count != 0)
            {
                builder.Remove(builder.Length - 1, 1);
            }
            else
            {
                builder.Append($"access_token={AccessToken}");
            }

            return builder.ToString();
        }

        private void btnRun_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(tbMethodName.Text))
            {
                MessageBox.Show("Не указано имя метода!");
                return;
            }

            // get authorization values from app.config
            int appId;
            try
            {
                string appIdValue = ConfigurationManager.AppSettings["appId"];
                appId = Convert.ToInt32(appIdValue);
            }
            catch (FormatException)
            {
                MessageBox.Show("Ошибка в разборе appId из app.config", "Ошибка приложения", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            string login = ConfigurationManager.AppSettings["login"];
            string password = ConfigurationManager.AppSettings["password"];

            btnRun.Enabled = btnGetTest.Enabled = false;

            // Authorize on vk server
            var api = new VkApi();
            try
            {
                api.Authorize(appId, login, password, Settings.All);
            }
            catch (VkApiException)
            {
                MessageBox.Show("Ошибка авторизации. Проверьте данные в app.config.", "Ошибка приложения", MessageBoxButtons.OK, MessageBoxIcon.Error);
                btnRun.Enabled = btnGetTest.Enabled = true;
                return;
            }

            // Combine parameters
            var parameters = new VkParameters();
            for (int i = 1; i < 11; i++)
            {
                var name = (TextBox) pnlParams.Controls.Find(string.Format("tbParamName{0}", i), false)[0];
                var value = (TextBox)pnlParams.Controls.Find(string.Format("tbParamValue{0}", i), false)[0];

                string paramName = name.Text.Trim();
                string paramValue = value.Text.Trim();

                if (string.IsNullOrEmpty(paramName)) continue;

                parameters.Add(paramName, paramValue);
            }

            string methodName = tbMethodName.Text.Trim();

            VkResponse response;
            try
            {
                response = api.Call(methodName, parameters);
            }
            catch (VkApiException ex)
            {
                MessageBox.Show(ex.InnerException != null ? ex.InnerException.Message : ex.Message, "Ошибка приложения",
                                MessageBoxButtons.OK, MessageBoxIcon.Error);
                btnRun.Enabled = btnGetTest.Enabled = true;
                return;
            }

            tbJson.Text = response.RawJson;

            _apiUrl = api.GetApiUrl(methodName, parameters);
            llVkApiUrl.Text = _apiUrl.Length > 80 ? _apiUrl.Substring(0, 80) + "..." : _apiUrl;

            btnRun.Enabled = btnGetTest.Enabled = true;
        }