private void ButtonChangePermissions_Click(object sender, RoutedEventArgs e)
        {
            if (ComboBoxSelectedProfile.SelectedIndex != -1)
            {
                ChangePermissionsWindow cpWindow = new ChangePermissionsWindow { parent = this };
                cpWindow.Show();
            }
            else
            {
                MessageBox.Show("Please choose a profile first.");
            }
        }

public partial class ChangePermissionsWindow : Window
    {
        private readonly string dbConnectionString = Properties.Settings.Default.dbConnectionString;
        public postLoginWindow parent { get; set; }

        public ChangePermissionsWindow()
        {
            InitializeComponent();
            ComboBoxValuesToShow();
        }

        private void ComboBoxValuesToShow()
        {
            using (SqlConnection connection = new SqlConnection(dbConnectionString))
            {
                try
                {
                    connection.Open();
                    if (TableFunctions.doesTableExist("ProfilePermissions", dbConnectionString))
                    {
                        string selectQuery = "SELECT Permissions from ProfilePermissions where ProfileName=@ProfileName";
                        using (SqlCommand command = new SqlCommand(selectQuery, connection))
                        {
                            command.Parameters.AddWithValue("@ProfileName", parent.ComboBoxSelectedProfile.Text);

                            ...Does not matter from here
     }