Şekil 1
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            OleDbConnection baglan = new OleDbConnection("Provider=Microsoft.Ace.Oledb.12.0;Data
Source= northwind.accdb");
            OleDbDataAdapter da = new OleDbDataAdapter();
            OleDbCommand cmd = new OleDbCommand();
            DataSet ds = new DataSet();
            baglan.Open();
            cmd.CommandText = "Select ID, FirstName,LastName,JobTitle,City From
Customers ";
            da.SelectCommand = cmd;
            cmd.Connection = baglan;
            da.Fill(ds, "Customers");
           comboBox1.DataSource = ds;
           comboBox1.DisplayMember = "Customers.ID";
           //combobox
ta seçili id deki müşteri bilgilerini textboxta gösteriyoruz.  
           this.textBox1.DataBindings.Add("Text", ds, "Customers.ID");
           this.textBox2.DataBindings.Add("Text", ds, "Customers.FirstName");
           this.textBox3.DataBindings.Add("Text", ds, "Customers.LastName");
           this.textBox4.DataBindings.Add("Text", ds, "Customers.JobTitle");
           this.textBox5.DataBindings.Add("Text", ds, "Customers.City");
           baglan.Close();
        }
    }
}
 
 
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