Primitive run count application (demo) protection

Author: Miroslav Stampar

URL: http://mstampar.awardspace.com/

// Primitive run count application (demo) protection

public static int GetRunCount()
{
   int count = 0;
   string guid = "";
   RegistryKey regKey = Registry.CurrentUser.OpenSubKey(@"Software\Classes\Software\Settings", true);

   if (regKey != null)
   {
       string temp = (string)regKey.GetValue("Options");
       guid = (string)regKey.GetValue("Guid");
       count = (int)(temp[0] ^ guid[0]);
   }

   return count;
}
public static int IncrementRun()
{
   int count = 0;
   string guid = "";
   RegistryKey regKey = Registry.CurrentUser.OpenSubKey(@"Software\Classes\Software\Settings", true);

   if (regKey == null)
   {
       regKey = Registry.CurrentUser.CreateSubKey(@"Software\Classes\Software\Settings");
       guid = Guid.NewGuid().ToString();
       regKey.SetValue("Guid", guid);
       count = 0;
   }
   else
   {
       string temp = (string)regKey.GetValue("Options");
       guid = (string)regKey.GetValue("Guid");
       count = (int)(temp[0] ^ guid[0]);
   }

   Random rnd = new Random();
   count++;
   string value = string.Format("{0}{1}", (char)(guid[0] ^ count), GenerateGarbage(15));

   regKey.SetValue("Options", value);

   return count;
}
private static string GenerateGarbage(int length)
{
   string retVal;
   if (length < 0)
       retVal = null;
   else if (length == 0)
       retVal = "";
   else
   {
       Random rnd = new Random();
       StringBuilder str = new StringBuilder();

       for (int i = 0; i < length; i++)
           str.Append((char)rnd.Next(33, 126));
       retVal = str.ToString();
   }
   return retVal;
}