Fetch multiple items to combobox from db

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace Fetch_multi_in_combobox
{
    public partial class Form1 : Form
    {
        string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
        OleDbCommand com;
        OleDbDataAdapter oda;
        DataSet ds;
        string str;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            comboBox1.Text = "Select";
            OleDbConnection con = new OleDbConnection(ConnectionString);
            con.Open();
            str = "select * from Students";
            com = new OleDbCommand(str, con);
            oda = new OleDbDataAdapter(com);
            ds = new DataSet();
            oda.Fill(ds, "Students");
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                comboBox1.Items.Add(ds.Tables[0].Rows[i]["StudentID"] + " ," + ds.Tables[0].Rows[i]["CourseID"] + " ," + ds.Tables[0].Rows[i]["FirstName"] + " ," + ds.Tables[0].Rows[i]["Surname"]);
            }
        }

        
    }
}

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