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    <p>What about using <a href="https://github.com/ExcelDataReader/ExcelDataReader" rel="noreferrer">Excel Data Reader</a> (previously hosted <a href="http://exceldatareader.codeplex.com/" rel="noreferrer">here</a>) an open source project on codeplex? Its works really well for me to export data from excel sheets. </p> <p>The sample code given on the link specified:</p> <pre><code>FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read); //1. Reading from a binary Excel file ('97-2003 format; *.xls) IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream); //... //2. Reading from a OpenXml Excel file (2007 format; *.xlsx) IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); //... //3. DataSet - The result of each spreadsheet will be created in the result.Tables DataSet result = excelReader.AsDataSet(); //... //4. DataSet - Create column names from first row excelReader.IsFirstRowAsColumnNames = true; DataSet result = excelReader.AsDataSet(); //5. Data Reader methods while (excelReader.Read()) { //excelReader.GetInt32(0); } //6. Free resources (IExcelDataReader is IDisposable) excelReader.Close(); </code></pre> <p><strong>UPDATE</strong></p> <p>After some search around, I came across this article: <a href="http://www.codeproject.com/script/Articles/ViewDownloads.aspx?aid=9992" rel="noreferrer">Faster MS Excel Reading using Office Interop Assemblies</a>. The article only uses <code>Office Interop Assemblies</code> to read data from a given Excel Sheet. The source code is of the project is there too. I guess this article can be a starting point on what you trying to achieve. See if that helps</p> <p><strong>UPDATE 2</strong></p> <p>The code below takes an <code>excel workbook</code> and reads all values found, for each <code>excel worksheet</code> inside the <code>excel workbook</code>.</p> <pre><code>private static void TestExcel() { ApplicationClass app = new ApplicationClass(); Workbook book = null; Range range = null; try { app.Visible = false; app.ScreenUpdating = false; app.DisplayAlerts = false; string execPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase); book = app.Workbooks.Open(@"C:\data.xls", Missing.Value, Missing.Value, Missing.Value , Missing.Value, Missing.Value, Missing.Value, Missing.Value , Missing.Value, Missing.Value, Missing.Value, Missing.Value , Missing.Value, Missing.Value, Missing.Value); foreach (Worksheet sheet in book.Worksheets) { Console.WriteLine(@"Values for Sheet "+sheet.Index); // get a range to work with range = sheet.get_Range("A1", Missing.Value); // get the end of values to the right (will stop at the first empty cell) range = range.get_End(XlDirection.xlToRight); // get the end of values toward the bottom, looking in the last column (will stop at first empty cell) range = range.get_End(XlDirection.xlDown); // get the address of the bottom, right cell string downAddress = range.get_Address( false, false, XlReferenceStyle.xlA1, Type.Missing, Type.Missing); // Get the range, then values from a1 range = sheet.get_Range("A1", downAddress); object[,] values = (object[,]) range.Value2; // View the values Console.Write("\t"); Console.WriteLine(); for (int i = 1; i &lt;= values.GetLength(0); i++) { for (int j = 1; j &lt;= values.GetLength(1); j++) { Console.Write("{0}\t", values[i, j]); } Console.WriteLine(); } } } catch (Exception e) { Console.WriteLine(e); } finally { range = null; if (book != null) book.Close(false, Missing.Value, Missing.Value); book = null; if (app != null) app.Quit(); app = null; } } </code></pre> <p>In the above code, <code>values[i, j]</code> is the value that you need to be added to the <code>dataset</code>. <code>i</code> denotes the row, whereas, <code>j</code> denotes the column. </p>
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    1. POHow do I import from Excel to a DataSet using Microsoft.Office.Interop.Excel?
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    1. COI'd still prefer to use Interop.Excel if possible, but this is a great backup plan. Thanks.
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      1. USJustin Morgan
    2. COIf you find something related to Interop.Excel, please post it over here. It would be nice to do something based on that too.
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    3. CO@Justin Morgan I have updated the answer with a link to an article on CodeProject which uses Office Interop Assemblies only. Let me know if that helps.
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