如何将excel列名放入C#组合框？

大家好，我正在尝试从电脑中的任何位置获取excel工作表，每当有人浏览并选择excel工作表时，我希望其列名列在组合框中。到目前为止，我已经完成了最难的部分的编码，但我仍然得到了一个小错误，即 Microsoft Access数据库引擎找不到对象“columns”。请确保该对象存在，并且正确拼写其名称和路径名。如果“columns”不是本地对象，请检查网络连接或与服务器管理员联系 但我已经成功地在SQLServer数据库上实现了相同的代码。只有在尝试访问excel工作表时，才会出现此错误。为什么会出现此错误以及如何修复它？多谢各位

    private String openfile()
    {

        string tempPath = "";
        OpenFileDialog fDialog = new OpenFileDialog();
        fDialog.Title = "open MSexcel file ";
        fDialog.Filter = "All Files(*.*)|*.*";
        fDialog.InitialDirectory = @"C:\";
        if (fDialog.ShowDialog() == DialogResult.OK)
        {

              tempPath = fDialog.FileName;
              return tempPath;

        }
        return null;
    }

    private void openpath(string path)
    {

        newconn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source="
                   + Convert.ToString(path) + ";Extended Properties=\"Excel 12.0;HDR={1}\";");




    }

    private void loadtolist()
    {
        newconn.Open();
        cmb.Items.Clear(); //cmb is combo box name
        newcmd = new OleDbCommand();
        newcmd.Connection = newconn;
        newcmd.CommandType = CommandType.Text;
        newcmd.CommandText = "SELECT column_name from information_schema.columns where table_name = 'BigData' Order by ordinal_position";

        dr = newcmd.ExecuteReader();
        if (dr.HasRows)

        {
            while (dr.Read())
            {
                cmb.Items.Add(dr[0].ToString());
            }

        }
        dr.Close();
        newconn.Close();
    }

试试这个

    string connectionString = string.Format(Thread.CurrentThread.CurrentCulture, "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=YES;'", excelFilePath);
    DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
    using (DbConnection connection = factory.CreateConnection())
    {
        connection.ConnectionString = connectionString;
        using (DbCommand command = connection.CreateCommand())
        {
            command.CommandText = @"SELECT [File], [ItemName], [ItemDescription], [Photographer name], [Date], [Environment site] FROM [Metadata$]";
            connection.Open();
            using (DbDataReader dr = command.ExecuteReader())
            {
                if (dr.HasRows)
                {
                    while (dr.Read())
                    {
                        .......
                    }
                }
            }
            connection.Close();
        }
    }