private async void Button_Click(object sender, RoutedEventArgs e)
{
var res = await ComicProcessor.CallRestLogin(txtRun.Text, txtPass.Password);
if (res == "Correcto")
{
Administrador _mostrar = new Administrador();
this.Close();
_mostrar.ShowDialog();
}
else
{
await this.ShowMessageAsync("Error", "El usuario no es valido");
}
}