Prüfen ob URL gültig ist

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/// <summary>
/// Check if the URL is valid.
/// </summary>
/// <param name="smtpHost">The URL.</param>
/// <returns></returns>
public static bool IsUrlValid(string smtpHost)
{
    bool response = false;
    try
    {
        IPHostEntry ipHost = Dns.Resolve(smtpHost);
        response = true;
    }
    catch (SocketException se)
    {
        response = false;
    }
    return response;
}