Create registry file

DateTime GetLastExecutionDate()
        {
            RegistryKey rkey = Registry.CurrentUser;
            RegistryKey rkey1 = rkey.OpenSubKey("software", true);
            RegistryKey rkey2 = rkey1.CreateSubKey("tes");
            DateTime lastDate = DateTime.Parse(rkey2.GetValue("LastDate").ToString());
            return lastDate;
        }
        void AddLastExecutionDate()
        {
            RegistryKey rkey = Registry.CurrentUser;
            RegistryKey rkey1 = rkey.OpenSubKey("software", true);
            RegistryKey rkey2 = rkey1.CreateSubKey("tes");
            rkey2.SetValue("LastDate", DateTime.Now.ToShortDateString());
        }