you can update, but you cannot delete,
see
HOW TO: Use ADO.NET to Retrieve and Modify Records in an Excel Workbook With Visual Basic .NET
http://support.microsoft.com/default.aspx?scid=kb;en-us;316934".....
Delete Records
Although the Jet OLE DB Provider allows you to insert and update records in an Excel workbook, it does not allow DELETE operations. If you try to perform a DELETE operation on one or more records, you receive the following error message: Deleting data in a linked table is not supported by this ISAM.
This limitation is inherent in the treatment of Excel workbooks as databases.
......"
see
HOW TO: Use ADO.NET to Retrieve and Modify Records in an Excel Workbook With Visual Basic .NET
http://support.microsoft.com/default.aspx?scid=kb;en-us;316934".....
Delete Records
Although the Jet OLE DB Provider allows you to insert and update records in an Excel workbook, it does not allow DELETE operations. If you try to perform a DELETE operation on one or more records, you receive the following error message: Deleting data in a linked table is not supported by this ISAM.
This limitation is inherent in the treatment of Excel workbooks as databases.
......"
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