providing expiry date to windows forms application?

Question

How to provide expiry date for some days running my application? Req: I am creating a windows application. In client machine wen i installed, It should work only for 5 days. After that it should show as date has expired, Application should not run. Plzzzz friends provide me answer.

Munesh Sharma · Answer

If you want to write the expiry date to the registry, then you'll need code such as this: using System; using System.IO; using Microsoft.Win32; // needed for registry access static class Program { static void Main(string[] args) { int period = 30; // trial period string keyName = "Software\Rano\SomeApp"; long ticks = DateTime.Today.Ticks; RegistryKey rootKey = Registry.CurrentUser; RegistryKey regKey = rootKey.OpenSubKey(keyName); if (regKey == null) // first time app has been used { regKey = rootKey.CreateSubKey(keyName); long expiry = DateTime.Today.AddDays(period).Ticks; regKey.SetValue("expiry", expiry, RegistryValueKind.QWord); regKey.Close(); } else { long expiry = (long)regKey.GetValue("expiry"); regKey.Close(); long today = DateTime.Today.Ticks; if (today > expiry) { Console.WriteLine("Your free trial has expired. Please register to continue using the application"); return; } } // code for rest of application Console.WriteLine("Rest of application continuing ..."); Console.ReadKey(); } } Rather than writing the actual date, I've converted it to 'ticks' and then stored that. If you're worried that your users may be knowledgeable enough to change the registry key with Regedit, then you can set the keyName and the name of the value ("expiry' in the SetValue method) to anything you like which will make them more difficult to identify. for more go on this link