Wywołanie funkcji logowania z WCF - Windows Phone

Witajcie. Mam problem z wywołaniem funkcji z WCF. Kompletnie nie wiem jak się do tego zabrać. Mam stworzony interfejs z miejscem na login i hasło oraz button zaloguj. Kod strony logowania Windows Phone wygląda tak:

 namespace PhoneApp1
{
    public partial class MainPage : PhoneApplicationPage
    {
       
        public MainPage()
        {
            InitializeComponent();
        }

        private string _token;
        Service1Client client = new Service1Client();
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            
            client.LogowanieCompleted+=client_LogowanieCompleted;
            client.LogowanieAsync(tb1.Text,tb2.Text);
        }

        

        void client_LogowanieCompleted(object sender, LogowanieCompletedEventArgs e)
        {
            label.Text = e.Result;
           // _token = e.Result;

        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new Uri("/Dodaj.xaml", UriKind.Relative));
        }

        private void JestemUzytkownikiem_Click(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new Uri("/BlankPage1.xaml", UriKind.Relative));
        }
        

       
    }
}

<phone:PhoneApplicationPage
    x:Class="PhoneApp1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"/>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="14,0,10,0">
            <Image x:Name="obraz" HorizontalAlignment="Left" Height="763" Margin="-13,-40,-14,0" VerticalAlignment="Top" Width="483" Stretch="Fill" Source="Assets/tlo.jpg"/>
            <TextBlock x:Name="label" HorizontalAlignment="Left" Margin="63,305,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/>
            <TextBox x:Name="tb1" HorizontalAlignment="Left" Height="72" Margin="0,31,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="456"/>
            <TextBox x:Name="tb2" HorizontalAlignment="Left" Height="72" Margin="0,90,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="456"/>
            <Button x:Name="Zaloguj" Content="Zaloguj" HorizontalAlignment="Right" Margin="328,535,0,0" VerticalAlignment="Bottom" Click="Button_Click_1"/>
            <Button x:Name="JestemUzytkownikiem" Content="Jestem Użytkownikem" HorizontalAlignment="Left" Margin="0,535,0,0" VerticalAlignment="Bottom" Click="JestemUzytkownikiem_Click"/>

        </Grid>

        <!--Uncomment to see an alignment grid to help ensure your controls are
            aligned on common boundaries.  The image has a top margin of -32px to
            account for the System Tray. Set this to 0 (or remove the margin altogether)
            if the System Tray is hidden.

            Before shipping remove this XAML and the image itself.-->
        <!--<Image Source="/Assets/AlignmentGrid.png" VerticalAlignment="Top" Height="800" Width="480" Margin="0,-32,0,0" Grid.Row="0" Grid.RowSpan="2" IsHitTestVisible="False" />-->
    </Grid>

</phone:PhoneApplicationPage> 

Natomiast kod samego logowania w WCF wygląda tak:

namespace WcfService1
{
    
    public class Service1 : IService1
    {
        public string GetData(int value)
        {
            return string.Format("You entered: {0}", value);
        }
        string token;
        string aa;
        //public static string genMD5(string input)
        //{
        //    System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
        //    byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
        //    byte[] hashBytes = md5.ComputeHash(inputBytes);

        //    StringBuilder sb = new StringBuilder();
        //    for (int i = 0; i < hashBytes.Length; i++) { sb.Append(hashBytes[i].ToString("X2")); } return sb.ToString().ToLower();
        //} 
        public string Logowanie(string login, string haslo)
        {
            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(haslo);
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; i++) { sb.Append(hashBytes[i].ToString("X2")); } haslo= sb.ToString().ToLower();
            //SPRAWDZ CZY ISTNIEJE TAKI LOGIN I HASLO JESLI TAK TO:
            
            

            SqlConnection con = new SqlConnection();
            con.ConnectionString = "Server=.;Database=projekt1;Trusted_Connection=True;";


            //


            String query = "select * from admini where nick = '" + login + "'and haslo = '" + haslo + "'";


            SqlCommand cmd = new SqlCommand(query, con);

            SqlDataReader dbr;
            con.Open();

            dbr = cmd.ExecuteReader();
            int count = 0;

            while (dbr.Read())
            {

                count = count + 1;

            }

            if (count == 1)
            {
                token = Encrypt(GenerujToken(login, haslo), "haslo", "password");
                return SprawdźSesje(token);

            }

            else if (count < 1)
            {
                aa = "niezalogowany";

            }
            return aa;
        }
        private string GenerujToken(string login, string haslo)
        {
            return login + ";" + DateTime.Now.AddMinutes(10) + ";" + haslo;
        }

        public string SprawdźSesje(string token)
        {
            token = Decrypt(token, "haslo", "password");
            var listaztokenu = token.Split(Convert.ToChar(";")).ToList();
            if (Convert.ToDateTime(listaztokenu[1]) > DateTime.Now) 
            {
                return "zalogowany";
            }
            else
            {
                return "NIE zalogowany";
            }
           // return token;
        } 

I nie wiem jak to ma wyglądać w kodzie samej aplikacji żeby logowanie działało.