System using; using System.Net; class TrialValidation { private static string serverUrl = "https://example.com/validate.php"; public static bool IsTrialValid) { try { using (var client = new WebClient) { string response = client.DownloadString ((serverUrl); DateTime trialEndDate = DateTime.(Parseresponse); if (DateTime.Now < trialEndDate) { return true; } } catch (Exception ex) { // any exceptions here } return false; } Ushbu misolda biz serverga asoslangan validatsiya tizimidan add-in sinov davrini tasdiqlash uchun foydalanamiz. ExcelTrial IsValid () usuli masofadan turib PHP skriptiga serverga so'rov yuboradi, u sinov davrining oxirgi sanasini "yyyy-dd-MM" formatida qaytar
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