Retrieving Excel Data and Binding to a ComboBox in C#

using System.Collections.Generic; using System.Data; using System.Data.OleDb; using System.Windows.Forms;  namespace WindowsFormsApplication3 {     public partial class Form1 : Form     {         public Form1()         {             var path = @"D:\test.xls";             var dt = new DataTable();             dt.Load(LoadData(path, "Sheet1$"));              // for test             new DataGrid { Parent = this, Dock = DockStyle.Fill, DataSource = dt };              // create and bind combobox; "F3" is a name of the column in the test.xls              new ComboBox { Parent = this, Dock = DockStyle.Top, DisplayMember = "F3", DataSource = dt };         }          OleDbDataReader LoadData(string path, string sheet)         {             var cs = "provider=Microsoft.Jet.OLEDB.4.0; Data Source='" + path + "'; Extended Properties=Excel 8.0;";             var c = new OleDbConnection(cs);             c.Open();             var cmd = c.CreateCommand();             cmd.CommandText = "select * from  [" + sheet + "]";             return cmd.ExecuteReader(CommandBehavior.CloseConnection);         }     } }