class $safeitemrootname$
    {
    }

========= To

public class $safeitemrootname$
    {
    }

        public static bool IsValidEmail(string to)
        {
            if (string.IsNullOrWhiteSpace(to))
                return false;

            try
            {
                var toEmail = new MailAddress(to);
                return toEmail != null;
            }
            catch
            {
                return false;
            }
        }

    public partial class App
    {
        public App()
        {
            this.DispatcherUnhandledException += appDispatcherUnhandledException;
            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
        }

<?xml version="1.0"?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
  <runtime>
     <legacyCorruptedStateExceptionsPolicy enabled="true" />
  </runtime>
</configuration>