Hi, See this Excel Help forum thread: http://www.excelforum.com/excel-programming/377761-adodb-is-unable-to-copy-more-than-255-chars-in-excel-cell.html[^] But to completely avoid this kind of issues, I recommend you try GemBox.Spreadsheet .NET Excel component for reading and writing XLS, XLSX, ODS, CSV and HTML files. It uses it's own engine to parse and write Excel files, and because of that it is 250x faster that Excel Interop and it doesn't have interoperability issues like Jet OleDb drivers for Excel.