private async Task loadReCapcha()
{
this.sp_ReCaptcha.Visibility = Visibility.Visible;
this.img_ReCaptcha.Source = null;
this.tb_ReCaptcha.Text = "";
try
{
this.recap = await ReCaptcha.FetchAsync();
this.img_ReCaptcha.Source = new BitmapImage(this.recap.ImageUri);
}
catch (Exception ex)
{
this.tb_info.Text = ex.GetMessage();
}
}