keep having this exception System.Data.OleDb.OleDbException (0x80004005):?

Question

i am developping a really simple program in c# with Visual studio, it consists simply by extracting data from an Excel sheet and transfer it to a database (only one table ), using MySql it worked i just saved the files as CSV and then imported them into my database but i had a big problem which was the encoding UTF8 i have many french characters ans arabic ones that just showed as random characters, so i went back to OleDb but it keeps shong exceptions now i am stuck with this one: System.Data.OleDb.OleDbException (0x80004005) i ve tried to change running config to x86 but nothing (notice that i am using a windows 8 X64). its a cummon ISAM problem.

please help me .

this is my code :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
using System.IO;
using System.Data.OleDb;

namespace testoledb

{
    public partial class Form1 : Form
    {
        DataSet OleDs = new DataSet();
        OleDbDataAdapter OleAdapter = new OleDbDataAdapter();
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {

        }

        private void upload_excl_Click(object sender, EventArgs e)
        {
            string path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            path = Path.Combine(path, "AGENDA.xlsx");

            string OleConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+path+@";Extend Properties=Excel 12.0 Macro;MDR=Yes;ImportMixedTypes=Text;TypeGuessRows=0"; //,HDR=Yes;IMEX=1""";

            OleDbConnection OleConn = new OleDbConnection(OleConnectionString);

            string OleStrCmd = "select * from [SHeet1$A1:H330]";

            OleDbCommand OleCmd = new OleDbCommand(OleStrCmd, OleConn);

            try
            {
                OleConn.Open();
                OleDs.Clear();
                OleAdapter.SelectCommand = OleCmd;
                OleAdapter.Fill(OleDs);
                dataGridView1.DataSource = OleDs.Tables[0];
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());

            }
            finally
            {
                OleConn.Close();
            }
        }
    }
}