Why Does Worksheet.Range Throw HRESULT: 0x800A03EC?

Troubleshooting HRESULT: 0x800A03EC in Worksheet.Range

Encountering the HRESULT: 0x800A03EC error when using Worksheet.Range typically indicates an attempt to access a range exceeding the row limit of older Excel file formats (.xls). This limitation restricts the maximum number of rows to 65,530.

Working with large datasets necessitates using the correct file format. For spreadsheets containing more rows than this limit, conversion to the modern .xlsx format is essential.

The following code snippet illustrates a potential source of the error:

<code class="language-csharp">Microsoft.Office.Interop.Excel.Range neededRange = currentWS.Range[cell.Cells[1, 1], cell.Cells[nRowCount, nColumnCount]];</code>

If nRowCount exceeds 65,530, this will trigger the error. To prevent this, ensure your spreadsheet is saved as an .xlsx file before executing code that accesses large ranges. The .xlsx format supports significantly more rows, resolving this limitation.

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