External table is not in the expected format

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C#

If Upload Excel File To sql Server Database If I Use .xlsx File Then it's Working Fine If i use the.xls then Error External table is not in the expected format.

string ExcelContentType = "application/vnd.ms-excel";
string Excel2010ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

if (fileuploadExcel.HasFile)
{
    //Check the Content Type of the file
    if (fileuploadExcel.PostedFile.ContentType == ExcelContentType || fileuploadExcel.PostedFile.ContentType == Excel2010ContentType)
    {
        try
        {
            //Save file path
            string path = string.Concat(Server.MapPath("~/TempFiles/"), fileuploadExcel.FileName);
            //Save File as Temp then you can delete it if you want
            fileuploadExcel.SaveAs(path);

            string excelConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+path+";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1;\"";
          // string excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+path+";Extended Properties=\"Excel 12.0 Xml;HDR=YES;\"";

            // Create Connection to Excel Workbook
            using (OleDbConnection connection = new OleDbConnection(excelConnectionString))
            {
                OleDbCommand command = new OleDbCommand("Select * FROM [Sheet1$]", connection);

                connection.Open();
                // Create DbDataReader to Data Worksheet
                using (DbDataReader dr = command.ExecuteReader())
                {
                    // SQL Server Connection String
                    string sqlConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString();
                    // Bulk Copy to SQL Server
                    using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
                    {
                        bulkCopy.DestinationTableName = "Excel_table";
                        bulkCopy.WriteToServer(dr);
                        lblMessage.Text = "The data has been exported succefuly from Excel to SQL";
                    }
                }
            }
        }
        catch (Exception ex)
        {
            lblMessage.Text = ex.Message;
        }
    }
}

connection.Open();
throws The Error Error External table is not in the expected format.