Fetch value and display to comboBox

Hi anyone can help me.

I want to retrieve data from my table and display it to combBox but i wont display. But when i switch to textBox it will display.

Code:

OleDbDataReader reader = cm.ExecuteReader();
                while (reader.Read())
                {

                  dataGridView2.Rows.Add(
                      reader["Employee Name"].ToString());

Datagridview:

private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                connection.Open();
                OleDbCommand cm = new OleDbCommand();
                cm.Connection = connection;
                cm.CommandText = query;
                OleDbDataReader reader = cm.ExecuteReader();
                while (reader.Read())
                {
             comboBox4.Text = dataGridView2.SelectedRows[0].Cells["Column8"].Value.ToString();
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