I have made a toolbar plugin for Excel using C#.NET interop.

As far as I can tell, the only way to read/write the contents of cells
is something like this:

    Range r = Excel._Application.Cells.Cells[row, col] as Range;
    string text = r.FormulaLocal as string;

i.e. by extracting a Range, which contains only one cell, and then
using the properties on that Range object to set/get the data.

This way seems to be horribly slow however, so I'm wondering if anyone
can tell me how to do it faster?

Thanks in advance.

Best regards,
Mogens