/// <summary>
        /// Handles the Click event of the Execute button.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        protected void Execute_Click(object sender, EventArgs e)
        {
            JSONRequest.Visible = false;

            var searchRequest = DSSerializer.Deserialize <DSSearchRequest>(json, jsonText.Text);

            var response = api.ExecuteSearch(searchRequest);

            ResultText.Text      = DSSerializer.Serialize(json, response);
            JSONResponse.Visible = true;
        }