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   | 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.IO;
using System.Data.OleDb;
 
namespace projetBE
{
    public partial class Form1 : Form
    {
 
        public Form1()
        {
 
            InitializeComponent();
        }
 
        private void openFileButton_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
        }
 
        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {
            string filePath = openFileDialog1.FileName;
            string extension = Path.GetExtension(filePath);
            string Excel03ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
            string Excel07ConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
            string header = rbHeaderYes.Checked ? "YES" : "NO";
            string conStr;
 
            conStr = string.Empty;
            switch (extension)
            {
 
                case ".xls": //Excel 97-03
                    conStr = string.Format(Excel03ConString, filePath, header);
                    break;
 
                case ".xlsx": //Excel 07
                    conStr = string.Format(Excel07ConString, filePath, header);
                    break;
            }
 
            //Get all worksheet names from the Excel file selected using GetSchema of an OleDbConnection
            OleDbConnection connection = new OleDbConnection(conStr);
            connection.Open();
            DataTable tables = connection.GetSchema("Tables", new String[] { null, null, null, "TABLE" });
            connection.Dispose();
 
           //Add each table name to the combo box
           if (tables != null && tables.Rows.Count > 0)
           {
              worksheetsComboBox.Items.Clear();
              foreach (DataRow row in tables.Rows)
              {
                worksheetsComboBox.Items.Add(row["TABLE_NAME"].ToString());
              }
           }
           }
 
        private void worksheetsComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            //Display the data from the selected Worksheet
            string filePath = openFileDialog1.FileName;
            string extension = Path.GetExtension(filePath);
            string Excel03ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
            string Excel07ConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
            string header = rbHeaderYes.Checked ? "YES" : "NO";
            string conStr;
 
            conStr = string.Empty;
            switch (extension)
            {
 
                case ".xls": //Excel 97-03
                    conStr = string.Format(Excel03ConString, filePath, header);
                    break;
 
                case ".xlsx": //Excel 07
                    conStr = string.Format(Excel07ConString, filePath, header);
                    break;
            }
 
            OleDbDataAdapter adapter = new OleDbDataAdapter(String.Format("SELECT * FROM [{0}]", worksheetsComboBox.SelectedItem.ToString()), conStr);
            DataTable currentSheet = new DataTable();
            adapter.Fill(currentSheet);
            adapter.Dispose();
 
            excelDataGridView.DataSource = currentSheet;
 
        }
 
        }
    } | 
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