XmlDocument excelData = new XmlDocument(); DataSet excelTableDataSet = new DataSet(); StreamReader excelContent = new StreamReader(excelFilePath, System.Text.Encoding.Default); string stringConnectToExcelFile = string.Format("provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excelFilePath + ";Extended Properties="Excel 12.0;""); System.Data.OleDb.OleDbConnection oleConnectionToExcelFile = new System.Data.OleDb.OleDbConnection(stringConnectToExcelFile); System.Data.OleDb.OleDbDataAdapter oleDataAdapterForGetExcelTable = new System.Data.OleDb.OleDbDataAdapter(string.Format("select * from [Sheet 1$]"), oleConnectionToExcelFile); try {     oleDataAdapterForGetExcelTable.Fill(excelTableDataSet); } catch {     return null; } string excelOutputXml = Path.GetTempFileName(); excelTableDataSet.WriteXml(excelOutputXml); excelData.Load(excelOutputXml); File.Delete(excelOutputXml); return excelData;