C# oledb驱动去取Excel报错

protected void Button1_Click(object sender, EventArgs e)
{
    OpenFileDialog pFileDialog = new OpenFileDialog();
    pFileDialog.Filter = "Excel Files|*.xls;*.xlsx";
    if (pFileDialog.ShowDialog() == DialogResult.OK)
    {
        string sExcelName = pFileDialog.FileName;
        string sExcelCon = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source='{0}';Extended Properties='Excel 8.0';", sExcelName);

        DataSet ds = new DataSet();
        List<string> sList = new List<string>();
        using (OleDbConnection pOldCon = new OleDbConnection(sExcelCon))
        {
            pOldCon.Open();
            DataTable dt = pOldCon.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                sList.Add(dt.Rows[i][2].ToString());
            }
            OleDbDataAdapter pOledbCnn = new OleDbDataAdapter("SELECT * FROM [" + sList[0] + "]", pOldCon);
            pOledbCnn.Fill(ds);
        }
        this.gridControl1.DataSource = ds.Tables[0];
    }
}