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    <p>You need to add a COM reference in your project to the <strong>"<code>Microsoft Excel 11.0 Object Library</code>"</strong> - or whatever version is appropriate.</p> <p>This code works for me:</p> <pre><code>private void AddWorksheetToExcelWorkbook(string fullFilename,string worksheetName) { Microsoft.Office.Interop.Excel.Application xlApp = null; Workbook xlWorkbook = null; Sheets xlSheets = null; Worksheet xlNewSheet = null; try { xlApp = new Microsoft.Office.Interop.Excel.Application(); if (xlApp == null) return; // Uncomment the line below if you want to see what's happening in Excel // xlApp.Visible = true; xlWorkbook = xlApp.Workbooks.Open(fullFilename, 0, false, 5, "", "", false, XlPlatform.xlWindows, "", true, false, 0, true, false, false); xlSheets = xlWorkbook.Sheets as Sheets; // The first argument below inserts the new worksheet as the first one xlNewSheet = (Worksheet)xlSheets.Add(xlSheets[1], Type.Missing, Type.Missing, Type.Missing); xlNewSheet.Name = worksheetName; xlWorkbook.Save(); xlWorkbook.Close(Type.Missing,Type.Missing,Type.Missing); xlApp.Quit(); } finally { Marshal.ReleaseComObject(xlNewSheet); Marshal.ReleaseComObject(xlSheets); Marshal.ReleaseComObject(xlWorkbook); Marshal.ReleaseComObject(xlApp); xlApp = null; } } </code></pre> <blockquote> <p>Note that you want to be very careful about <a href="https://stackoverflow.com/questions/158706/how-to-properly-clean-up-excel-interop-objects-in-c">properly cleaning up and releasing your COM object references</a>. Included in that StackOverflow question is a useful rule of thumb: <em>"Never use 2 dots with COM objects"</em>. In your code; you're going to have real trouble with that. <em>My demo code above does NOT properly clean up the Excel app, but it's a start!</em></p> </blockquote> <p>Some other links that I found useful when looking into this question:</p> <ul> <li><a href="http://www.codeproject.com/KB/office/csharp_excel.aspx" rel="nofollow noreferrer">Opening and Navigating Excel with C#</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms173186(VS.80).aspx" rel="nofollow noreferrer">How to: Use COM Interop to Create an Excel Spreadsheet (C# Programming Guide)</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/6fczc37s(VS.80).aspx" rel="nofollow noreferrer">How to: Add New Worksheets to Workbooks</a></li> </ul> <p>According to MSDN </p> <blockquote> <p>To use COM interop, you must have administrator or Power User security permissions.</p> </blockquote> <p>Hope that helps.</p>
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