érreure CS1061 dans visual studio

namespace WpfApplication2
{
    /// <summary>
    /// Logique d'interaction pour MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {

        public void Button_Valid_Age_Click(object sender, RoutedEventArgs e)
        {
            string chaineage = Age.Text;
            int age;
            int heure = DateTime.Now.Hour;
            int minute = DateTime.Now.Minute;
            string majeur;
            if (int.TryParse(chaineage, out age))
            {
                if (age < 18)
                    majeur = "mineur";
                else
                    majeur = "majeur";
                string name = Environment.UserName;
                Text1.Content = "Bonjour " + name + "\n" + name + " tu as " + age + " ans."
                    + "\n" + name + " tu est " + majeur;

            }
            else
            {
                Text1.Content = "Age incorecte Veuiller resaisir votre age";
            }

        }

        private void button_game_Click(object sender, RoutedEventArgs e)
        {
            int valeuratrouver = new Random().Next(0, 100);
            bool trouver = false;
            int nombredecoups = 0;
            while (!trouver)
            {
                string saisie = number.Text;
                int valeursaisie;
                if (int.TryParse(saisie, out valeursaisie))
                {
                    if (valeursaisie == valeuratrouver)
                        trouver = true;
                    else
                    {
                        if (valeursaisie < valeuratrouver)
                            plus_or_moins.Content = "Trop petit ...";
                        else
                            plus_or_moins.Content = ("trop grand ...");
                    }
                    nombredecoups++;

                }
                else
                    plus_or_moins.Content = ("valeur incorrecte");
            }
            Result.Content = ("Vous avez trouver en " + nombredecoups + " coups");


        }
    }
}

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Label x:Name="Script_your_name" Content="Ecrie ton age" HorizontalAlignment="Left" Height="24" Margin="10,10,0,0" VerticalAlignment="Top" Width="119"/>
        <TextBox x:Name="Age" HorizontalAlignment="Left" Height="24" Margin="129,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="195"/>
        <Button x:Name="Button_Valid_Age" Content="Valide ton age ici" HorizontalAlignment="Left" Height="24" Margin="329,10,0,0" VerticalAlignment="Top" Width="179" Click="Button_Valid_Age_Click"/>
        <Label x:Name="Text1" Content="" HorizontalAlignment="Left" Height="60" Margin="10,39,0,0" VerticalAlignment="Top" Width="498"/>
        <Button x:Name="button_game" Content="Cliquer-ici pour faire le jeu du plus ou du moins" HorizontalAlignment="Left" Height="23" Margin="10,99,0,0" VerticalAlignment="Top" Width="498" Click="button_game_Click"/>
        <Label x:Name="plus_or_moins" Content="" HorizontalAlignment="Left" Height="28" Margin="10,127,0,0" VerticalAlignment="Top" Width="231"/>
        <TextBox x:Name="number" HorizontalAlignment="Left" Height="28" Margin="246,127,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="262" TextChanged="textBox_TextChanged"/>
        <Label x:Name="Result" Content="
" HorizontalAlignment="Left" Height="25" Margin="10,155,0,0" VerticalAlignment="Top" Width="498"/>

    </Grid>
</Window>