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        public static void SaveDataContent()
        {
            FileStream fs = new FileStream(Login.userPath + "/data.pswc", FileMode.Open);
            BinaryFormatter bf = new BinaryFormatter();
            bf.Serialize(fs, Data.pswList);
        }

        public static void LoadDataContent()
        {
            try
            {
                FileStream fs = new FileStream(Login.userPath + "/data.pswc", FileMode.Open);
                BinaryFormatter bf = new BinaryFormatter();
                Data.pswList = (List<Data>)bf.Deserialize(fs);
            }
            catch (SerializationException)
            { }
        }					

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        private void fillDataGrid()
        {
            dt.Clear();

            for (int i = 0; i < Data.pswList.Count; i++)
            {
                if (Data.pswList[i].Tn.Equals(treeView1.SelectedNode))
                {
                    DataRow dr = dt.NewRow();
                    dr[0] = Data.pswList[i].Title; dr[1] = Data.pswList[i].Username; dr[2] = Data.pswList[i].Psw;
                    dr[3] = Data.pswList[i].Url; dr[4] = Data.pswList[i].Comments;

                    dt.Rows.Add(dr);
                }
            }

            dataGridView1.DataSource = dt;
        }					

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catch (SerializationException)
{ }					

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dataGridView1.DataSource = Data.pswList.Where(x => x.Tn.Equals(treeView1.SelectedNode));					

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private void meinLiebesDataGrid_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
            if (e.ColumnIndex == derIndexMeinerLinkColumn)
               Process.Start((MeineLiebeBindingSource.Current as Data).Url);
}					

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private void meinLiebesDataGrid_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{            
    if ((e.ColumnIndex == derIndexMeinerLinkColumn) && (e.Value != null))
    {
        var box = new TextBox();
        box.UseSystemPasswordChar = true;
        e.Value = new String(box.PasswordChar, e.Value.ToString().Length);
    }
}

private void meinLiebesDataGrid_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (meinLiebesDataGrid.CurrentCell.ColumnIndex == derIndexMeinerLinkColumn)
    {
        var box = e.Control as TextBox;
        if (box != null)
            box.UseSystemPasswordChar = true;
    }
}