C# Return List of Databases in Combobox

I have two comboboxes, comboBoxSelectServer and comboBoxSelectDatabase.

Based on the value selected in comboBoxSelectServer when the user clicks on comboBoxSelectDatabase they will get the various databases from that server.

However, when running the application I'm not getting any databases returned in comboBoxSelectDatabase.

I think its due to the below section of my code, as on debugging its not pulling back anything.

comboBoxSelectDatabase.Items.Add(command);

I've included my code below;

if (comboBoxSelectServer.SelectedIndex == 0)
{
    string commandTextSERV1 = "SELECT name FROM master.sys.databases " +
                              "where name LIKE 'Client_%'";

    string connectionString = Properties.Settings.Default.connectionStringSERV1;

    using (SqlConnection con = new SqlConnection(connectionString))
    {
        SqlCommand command = new SqlCommand(commandTextSERV1, con);

        try
        {
            con.Open();
            command.ExecuteNonQuery();
            SqlDataReader reader = command.ExecuteReader();

            if (reader.Read())
            {
                comboBoxSelectDatabase.Items.Add(command);
            }
            else
            {
                MessageBox.Show("Error");
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        finally
        {
            con.Close();
        }
    }
}