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  private void button8_Click(object sender, RoutedEventArgs e)
       {
           try
           {
            var obj = (tbladdressDataGrid.SelectedItem as DataRowView).Row as DataRow;
            var objValue = obj["fldid"];

            string pupid = objValue.ToString();

            Window4 addupdate = new Window4();
            addupdate.Show();
            }
            catch
            {
            MessageBox.Show("Wählen sie einen Datensatz aus.","Hinweis");
            }
        }					

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  public MainWindow()
        {
            InitializeComponent();
        }
        public static string pupid;					

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string id = MainWindow.pupid;					

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var objRow = xamDataGridAdressen.ActiveRecord as Infragistics.Windows.DataPresenter.DataRecord;

                if (objRow == null)
                {
                    MessageBox.Show("Bitte eine Zeile auswählen!", "Keine Zeile ausgewählt!");
                    return;
                }

                var fldidValue = objRow.Cells["fldid"].Value;
                var name01Value = objRow.Cells["fldname01"].Value;
                var name02Value = objRow.Cells["fldname02"].Value;
                var name03Value = objRow.Cells["fldname03"].Value;
                var strasseValue = objRow.Cells["fldstrasse"].Value;
                var plzValue = objRow.Cells["fldplz"].Value;
                var ortValue = objRow.Cells["fldnort"].Value;
                var landValue = objRow.Cells["fldland"].Value;
                var telefonValue = objRow.Cells["fldtelefon"].Value;
                var emailValue = objRow.Cells["fldemail"].Value;


                //w1ID = Convert.ToString(fldidValue);

                Window5 w5 = new Window5();

                w5.textBoxID.Text = Convert.ToString(fldidValue);


                w5.Show();					

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string pupid = objValue.ToString();