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 class Aktie
    {
        private string URL { get; set; }

        public DataTable MakeURL(string aktienName, object Höchstwert, object Tiefstwert)
        {
            string URL = "http://finance.yahoo.com/d/quotes.csv?s=";
            URL = URL + aktienName + "&f=" + "s" + Höchstwert + Tiefstwert;

            List<string[]> result = parseCSV(URL);
            DataTable daten = new DataTable();
            foreach (string column in result[0])
            {
                daten.Columns.Add();
            }

            foreach (string[] row in result)
            {
                daten.Rows.Add(row);
            }

            return daten;
        }

        public List<string[]> parseCSV(string url)
        {
            List<string[]> parsedData = new List<string[]>();

            using (StreamReader readFile = new StreamReader(url))
            {
                string line;
                string[] row;

                while ((line = readFile.ReadLine()) != null)
                {
                    row = line.Split(',');
                    parsedData.Add(row);
                }
            }

            return parsedData;
        }
    }					

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public static string GetUrlResponse(string url,string username,string password)
{
    string content = null;
 
    WebRequest webRequest = WebRequest.Create(url);
 
    if(username == null || password == null)
    {
        NetworkCredential networkCredential = new NetworkCredential(username, password);
        webRequest.PreAuthenticate = true;
        webRequest.Credentials = networkCredential;
    }
 
    WebResponse webResponse = webRequest.GetResponse();
 
    StreamReader sr = new StreamReader(webResponse.GetResponseStream(), Encoding.ASCII);
content = sr.ReadToEnd();
 
    return content.ToString();
}					

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    public class Aktie
    {
        public string Name { get; set; }
        public string Symbol { get; set; }
        public int Aktuell { get; set; }
        public int Veraenderung { get; set; }
        public int Vortag { get; set; }
        public int Eroeffnung { get; set; }
        public int Volumen { get; set; }
    }					

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private void ButtonAdd_Click(object sender, RoutedEventArgs e)
        {
            AktieListe neueAktienListe = new AktieListe();
            Window1 main = new Window1();
            main.ListviewAktien.DataContext = neueAktienListe.GetUrlResponse(txtAktienName.Text);
            this.Close();
        }					

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 public class AktieListe
    {
        private string URL { get; set; }

        public List<Aktie> GetUrlResponse(string aktie)
        {
            List<Aktie> gezeichneteAktienListe = new List<Aktie>();
            URL = "http://finance.yahoo.com/d/quotes.csv?s=" + aktie + "&f=" + "n" + "s" + "l";

            WebRequest webRequest = WebRequest.Create(URL);
            WebResponse webResponse = webRequest.GetResponse();
            StreamReader sr = new StreamReader(webResponse.GetResponseStream(), Encoding.ASCII);

            string line;
            string[] row;
            List<string[]> parsedData = new List<string[]>();
            Aktie neueAktie = new Aktie();

            //aufsplittung des CSV Files (nach Komma)
            while ((line = sr.ReadLine()) != null)
            {
                row = line.Split(',');
                parsedData.Add(row);

                //Daten abfüllen in Aktienobject
                neueAktie.Name = row[0].ToString();
                neueAktie.Symbol = row[1].ToString();
            }
            gezeichneteAktienListe.Add(neueAktie);
            return gezeichneteAktienListe;
        }
    }					

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<StackPanel Margin="5" x:Name="Main">
        <StackPanel x:Name="ManageAktien" Orientation="Horizontal">
            <ListView Height="170" Name="ListviewAktien" TabIndex="1" Width="700" HorizontalAlignment="Left" SelectionMode="Single"  ItemsSource="{Binding}">
                <ListView.View>
                    <GridView>
                        <GridViewColumn Width="100" Header="Name" DisplayMemberBinding="{Binding Name}" />
                        <GridViewColumn Width="50" Header="Symbol" DisplayMemberBinding="{Binding Symbol}"/>
                        <GridViewColumn Width="80" DisplayMemberBinding="{Binding Aktuell}">Aktuell</GridViewColumn>
                        <GridViewColumn Width="80" DisplayMemberBinding="{Binding Veraenderung}">Veränderung</GridViewColumn>
                        <GridViewColumn Width="80" DisplayMemberBinding="{Binding Vortag}">Vortag</GridViewColumn>
                        <GridViewColumn Width="80" DisplayMemberBinding="{Binding Eroeffnung}">Eröffnung</GridViewColumn>
                        <GridViewColumn Width="80" DisplayMemberBinding="{Binding Volumen}">Volumen</GridViewColumn>
                    </GridView>
                </ListView.View>
            </ListView>
            <Button Height="23" Name="btnAddNeueAktie" Margin="10" Width="117" VerticalContentAlignment="Top" VerticalAlignment="Top" Click="btnAddNeueAktie_Click">Neue Aktie hinzufügen</Button>
        </StackPanel>
    </StackPanel>					

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F:\2_Privat\StockManager\StockManager\Window1.xaml(8,134): error MC1000: Unknown build error, 'Key cannot be null.
F:\2_Privat\StockManager\StockManager\Window1.xaml(8,134): error MC1000: Parameter name: key Line 8 Position 134.' 
Done building project "StockManager.csproj" -- FAILED.